>From "cold start" of MonoDevelop (2.8.4.1) to failing to run the app once 
>these are the errors in my Message log.

Also my breakpoints are throwing erros in MonoDevelop now (it doesn't crash).. 
to be clean I'll start a new thread for that issue.

(these two from running the app)
Error - 2:38:22 PM - Exception while loading assemblies: {0}
System.NullReferenceException: Object reference not set to an instance of an 
object
  at MonoDevelop.MonoDroid.Utils.ResolveAssemblies.AddAssemblyReferences 
(System.Collections.Generic.List`1 assemblies, Mono.Cecil.AssemblyDefinition 
assembly) [0x00000] in <filename unknown>:0
  at MonoDevelop.MonoDroid.Utils.ResolveAssemblies.Run () [0x000b4] in 
/private/tmp/source/md-addins/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid/Utils/AssemblyHelper.cs:205


Error - 2:38:22 PM - Error in async operation chain
System.ArgumentNullException: Argument cannot be null.
Parameter name: source
  at System.Linq.Check.SourceAndPredicate (System.Object source, System.Object 
predicate) [0x00000] in <filename unknown>:0
  at System.Linq.Enumerable.Where[String] (IEnumerable`1 source, System.Func`2 
predicate) [0x00000] in <filename unknown>:0
  at MonoDevelop.MonoDroid.Utils.ResolveAssemblies.get_ResolvedUserAssemblies 
() [0x00000] in 
/private/tmp/source/md-addins/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid/Utils/AssemblyHelper.cs:172
  at MonoDevelop.MonoDroid.AndroidToolbox.InstallAssemblies 
(Mono.AndroidTools.AndroidDevice device, Boolean external, System.String tmp, 
System.String target, System.String packageName, System.IO.TextWriter 
outputLog, System.IO.TextWriter errorLog) [0x000d8] in 
/private/tmp/source/md-addins/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid/Adb/AndroidToolbox.cs:286
  at 
MonoDevelop.MonoDroid.MonoDroidUploadOperation+<MonoDroidUploadOperation>c__AnonStorey22.<>m__71
 () [0x0000b] in 
/private/tmp/source/md-addins/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid/MonoDroidUtility.cs:574
  at MonoDevelop.MonoDroid.ChainedAsyncOperationSequence.RunNext () [0x000df] 
in 
/private/tmp/source/md-addins/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid/MonoDroidUtility.cs:774
  at MonoDevelop.MonoDroid.ChainedAsyncOperationSequence.OpCompleted 
(IAsyncOperation op) [0x00112] in 
/private/tmp/source/md-addins/MonoDevelop.MonoDroid/MonoDevelop.MonoDroid/MonoDroidUtility.cs:816

(this one from startup of MonoDevelop)
Error - 2:32:22 PM - Error loading policy file 'Default.mdpolicy.xml' file 
'/Users/jhandel/Library/MonoDevelop-2.8/Policies/Default.mdpolicy.xml':
System.InvalidOperationException: Could not set property 'Text' in type 
'StandardHeader' ---> System.InvalidCastException: Cannot cast from source type 
to destination type.
  at MonoDevelop.Core.Serialization.PrimitiveDataType.OnDeserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/PrimitiveDataType.cs:52
  at MonoDevelop.Core.Serialization.DataSerializer.OnDeserialize 
(MonoDevelop.Core.Serialization.DataType dataType, 
MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataSerializer.cs:101
  at MonoDevelop.Core.Serialization.DataType.Deserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataType.cs:106
  at MonoDevelop.Core.Serialization.ItemProperty.OnDeserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, 
MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ItemProperty.cs:290
  at MonoDevelop.Core.Serialization.DataSerializer.OnDeserializeProperty 
(MonoDevelop.Core.Serialization.ItemProperty prop, 
MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
instance, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataSerializer.cs:121
  at MonoDevelop.Core.Serialization.ItemProperty.Deserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
instance, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ItemProperty.cs:285
  at MonoDevelop.Core.Serialization.ClassDataType.Deserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object obj, 
MonoDevelop.Core.Serialization.DataCollection itemData, 
MonoDevelop.Core.Serialization.DataItem ukwnDataRoot, System.String baseName) 
[0x001c1] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ClassDataType.cs:523
  --- End of inner exception stack trace ---
  at MonoDevelop.Core.Serialization.ClassDataType.Deserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object obj, 
MonoDevelop.Core.Serialization.DataCollection itemData, 
MonoDevelop.Core.Serialization.DataItem ukwnDataRoot, System.String baseName) 
[0x00279] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ClassDataType.cs:539
  at MonoDevelop.Core.Serialization.ClassDataType.DeserializeNoCustom 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object obj, 
MonoDevelop.Core.Serialization.DataCollection itemData) [0x0007d] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ClassDataType.cs:465
  at MonoDevelop.Core.Serialization.ClassDataType.OnDeserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data, System.Object obj) 
[0x0003a] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ClassDataType.cs:453
  at MonoDevelop.Core.Serialization.DataSerializer.OnDeserialize 
(MonoDevelop.Core.Serialization.DataType dataType, 
MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data, System.Object 
valueInstance) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataSerializer.cs:106
  at MonoDevelop.Core.Serialization.DataType.Deserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data, System.Object 
valueInstance) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataType.cs:111
  at MonoDevelop.Core.Serialization.ClassDataType.OnDeserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data) [0x0015d] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/ClassDataType.cs:409
  at MonoDevelop.Core.Serialization.DataSerializer.OnDeserialize 
(MonoDevelop.Core.Serialization.DataType dataType, 
MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataSerializer.cs:101
  at MonoDevelop.Core.Serialization.DataType.Deserialize 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Object 
mapData, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataType.cs:106
  at MonoDevelop.Core.Serialization.DataContext.LoadConfigurationData 
(MonoDevelop.Core.Serialization.SerializationContext serCtx, System.Type type, 
MonoDevelop.Core.Serialization.DataNode data) [0x00008] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataContext.cs:114
  at MonoDevelop.Core.Serialization.DataSerializer.Deserialize (System.Type 
type, MonoDevelop.Core.Serialization.DataNode data) [0x00000] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Serialization/DataSerializer.cs:76
  at MonoDevelop.Projects.Policies.PolicyService.RawDeserialize 
(MonoDevelop.Core.Serialization.DataNode data) [0x000d4] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Policies/PolicyService.cs:206
  at MonoDevelop.Projects.Policies.PolicyService.DiffDeserialize 
(MonoDevelop.Core.Serialization.DataItem item) [0x00031] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Policies/PolicyService.cs:242
  at 
MonoDevelop.Projects.Policies.PolicyService+<DiffDeserializeXml>c__Iterator70.MoveNext
 () [0x000cd] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Policies/PolicyService.cs:177
  at MonoDevelop.Projects.Policies.PolicySet.LoadFromXml (System.Xml.XmlReader 
reader) [0x00100] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Policies/PolicySet.cs:187
  at MonoDevelop.Projects.Policies.PolicyService.<LoadPolicy>m__75 
(System.IO.StreamReader reader) [0x0007b] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Policies/PolicyService.cs:1224
  at MonoDevelop.Projects.Policies.PolicyService.ParanoidLoad (System.String 
fileName, System.String friendlyName, System.Action`1 read) [0x00019] in 
/private/tmp/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Policies/PolicyService.cs:1251

Hope this is helpful.


Josh
________________________________
From: [email protected] [[email protected]] 
on behalf of Andreia Gaita [[email protected]]
Sent: Monday, December 05, 2011 2:26 PM
To: Discussions related to Mono for Android
Subject: Re: [mono-android] 4.0 crashing previously working source.

Hi again,

Do any errors show up in the Message Log (accessible via the View / Pads menu), 
something like "Exception while loading assemblies"?

andreia gaita

On Mon, Dec 5, 2011 at 8:08 PM, Josh Handel 
<[email protected]<mailto:[email protected]>> wrote:
Scrubbed squeaky clean, even created a new Emulator for it, even cleaned and 
rebuilt all the other assemblies the project used and re-referenced them (with 
cleaning between references to make sure MonoDevelop was really really really 
using the new stuff).. But sadly no dice :-(

this is my output when I try to debug.

Waiting for packaging processing to complete

Getting package list from device

Installing package
649 KB/s (52666 bytes in 0.079s)
       pkg: /data/local/tmp/monodroiddeltaforce.monodroiddeltaforce-Signed.apk
Success

Installing assemblies

Internal error. Argument cannot be null.
Parameter name: source



Josh


________________________________________
From: 
[email protected]<mailto:[email protected]> 
[[email protected]<mailto:[email protected]>] 
on behalf of Jonathan Pryor [[email protected]<mailto:[email protected]>]
Sent: Monday, December 05, 2011 1:45 PM
To: Discussions related to Mono for Android
Subject: Re: [mono-android] 4.0 crashing previously working source.

On Dec 5, 2011, at 2:44 PM, Josh Handel wrote:
>    I just upgraded to 4.0 and now a previously working project won't startup 
> on the emulator/debugger. The only error I get is
>
> Internal error. Argument cannot be null.
> Parameter name: source
>
> this happens after "Installing assemblies"

Please Clean and rebuild your project first.

If you're using MonoDevelop, please try using the recently released MonoDevelop 
2.8.4.1.

Thanks,
 - Jon

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