I just found this old email by a very similar exception logged as:

https://github.com/galaxyproject/galaxy/issues/2987

There do seem to be some corner cases where missing default
values are not handled nicely.

Peter


On Tue, Jan 26, 2016 at 2:38 PM, Matthias De Smet
<matthias.des...@ugent.be> wrote:
> Wow, great tip! This fixed it!
>
> Thanks a bunch!
> Matthias
>
>
>> Op 26 jan. 2016, om 15:20 heeft Hans-Rudolf Hotz <h...@fmi.ch> het volgende 
>> geschreven:
>>
>> Hi Matthias
>>
>>
>> Make sure 'listing' is a list of (displayName,value,boolean)
>>
>> Though, there might be other errors as well
>>
>>
>> Regards, Hans-Rudolf
>>
>> I am not sure, whether this
>> On 01/26/2016 01:22 PM, Matthias De Smet wrote:
>>> Hi all,
>>>
>>> I’m trying to develop a tool that lets you select a file on the server.
>>> I’m using the dynamic_options setting to let Galaxy render a dropdown
>>> list of available file.
>>>
>>>
>>> However, when I try to test the tool in its current form, I get the
>>> following error:
>>>
>>> <pre>
>>> galaxy.web.framework.decorators ERROR 2016-01-26 13:08:35,649 Uncaught
>>> exception in exposed API method:
>>> Traceback (most recent call last):
>>>   File "lib/galaxy/web/framework/decorators.py", line 260, in decorator
>>>     rval = func( self, trans, *args, **kwargs)
>>>   File "lib/galaxy/webapps/galaxy/api/tools.py", line 98, in build
>>>     return tool.to_json(trans, kwd.get('inputs', kwd))
>>>   File "lib/galaxy/tools/__init__.py", line 2602, in to_json
>>>     populate_state(trans, self.inputs, state_inputs, state_errors,
>>> params.__dict__)
>>>   File "lib/galaxy/tools/__init__.py", line 2471, in populate_state
>>>     state[input.name] = input.get_initial_value(trans, context,
>>> history=history)
>>>   File "lib/galaxy/tools/parameters/basic.py", line 984, in
>>> get_initial_value
>>>     value = [ optval for _, optval, selected in options if selected ]
>>> ValueError: too many values to unpack
>>> </pre>
>>>
>>> My tool xml looks like this:
>>>
>>> <pre>
>>>
>>> <tool id="archivetolibrary" name="Copy files" version="0.1.0">
>>>   <description>from the archive to a data library</description>
>>>   <code file="list_files.py"/>
>>>   <command interpreter="bash">
>>>     test.sh > $log
>>>   </command>
>>>   <inputs>
>>>     <param name="archive_source" type="select" display="radio"
>>> label="Choose source archive">
>>>       <options from_file="archives.loc">
>>>         <column name="name" index="0"/>
>>>         <column name="value" index="1"/>
>>>       </options>
>>>     </param>
>>>     <param name="query" type="text" label="Search for files"/>
>>>     <param name="selected_file" type="select" label="Choose your file"
>>> dynamic_options="list_files(archive_source,query)"/>
>>> </inputs>
>>>   <outputs>
>>>     <data name="log" format="txt" label="${tool.name} on
>>> ${on_string}"></data>
>>>  </outputs>
>>>   <tests>
>>>     <test>
>>>     </test>
>>>   </tests>
>>>   <help>
>>> This tool copies data from and archive folder to your history. Keep in
>>> mind this folder MUST be readable by Galaxy in order for this tool to work.
>>>   </help>
>>> </tool>
>>>
>>> </pre>
>>>
>>> and the script called in the “code” tag looks like this
>>>
>>> <pre>
>>> def list_files(dir,query): listing=[]
>>> for fname in listdir(dir):
>>>  fullpath = path.join(dir, fname) #only select datafiles, not md5
>>> checksums
>>>  if path.isfile(fullpath) and not fullpath.endswith(".md5"):
>>>  listing.append( fname )
>>> return listing
>>> </pre>
>>>
>>> This script should return a list with filenames that should be displayed
>>> in the dropdown list.
>>>
>>> I’m tracking Galaxy release 15.10, running on a Ubuntu 14.04.3 server
>>>
>>> Thanks for your help!
>>>
>>> Matthias
>>>
>>>
>>>
>>>
>>>
>>>
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>
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