The issue you're seeing is actually related to improper initialization of the 
workflow parameters index in the special case where a particular parameter is 
only used in a rename action and not in a tool step.  This is fixed in revision 
5400:6cacf178a129.

-Dannon


On Apr 20, 2011, at 10:28 AM, Peter Cock wrote:

> Hi all,
> 
> I noticed a new problem with our local Galaxy (recently updated),
> but found it happens on the public installation too.
> 
> I can edit workflows, and create run time parameters like ${Name}
> or ${Name with spaces}, but when I come to run the workflow I get
> an error:
> 
>> Server Error
>> An error occurred. See the error logs for more information.
>> (Turn debug on to display exception reports here)
> 
> e.g. This trivial example takes a FASTA file, does a minimum length
> filter, and tries to rename the output to a run time parameter string:
> 
> http://main.g2.bx.psu.edu/u/peterjc/w/test-workflow-filter-fasta-min-length-10
> 
> Is this a known issue? I couldn't find a match on the bitbucket
> tracker.
> 
> Thanks,
> 
> Peter
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