.net - Cannot load updated activity from the instance store -

i've been plagued error resuming workflows in rather complex system , far had little luck finding solution it.

the error happens when resume workflow. workflow , activities have changed there versioning in place shouldn't affect that. resume operation brings out old version of xaml file , calls old version of activities , has been working year now.

started testing new version of system , error: the instance 'some guid' found in instance store, instance not workflow instance

this happens in resume method of worklfow , in particular in line :

application.load(resumecontext.workflowinstanceid); 

in database can find instance guid , looks okay can't understand why wouldn't load.

i found one page in entire google error , there's no answer it, it's desert out there.

the stack trace useless:

exception: system.exception: exception of type 'system.exception' thrown.     @ system.activities.workflowapplication.extractruntimestate(idictionary`2 values, guid instanceid)    @ system.activities.workflowapplication.processinstancevalues(idictionary`2 values, object& deserializedruntimestate)    @ system.activities.workflowapplication.loadcore(dynamicupdatemap updatemap, timeouthelper timeouthelper, boolean loadany, idictionary`2 values)    @ system.activities.workflowapplication.load(guid instanceid, timespan timeout)    @ system.activities.workflowapplication.load(guid instanceid)    @ project.ts.services.workflows.hosting.activityinvoker.resume[tresponse](workflowapplication application, instancestore instancestore, resumebookmarkcontext`1 resumecontext, idictionary`2& outarguments)     in c:\projects\ts\trunk\services\workflows\hosting\activityinvoker.cs:line 186 

some more info. way works operation object contains workflow version, name , actual xaml , gets loaded workflow application , gets invoked:

var workflowdefinition = activityresolver.resolve(new workflowidentity(operation.workflowversion, operation.workflowname, operation.workflowxaml));  var application = new workflowapplication(workflowdefinition.implementation);  response = activityinvoker.resume<resumeoperationresponse>(application, instancestoreprovider.create(), resumecontext, out outarguments); 

inside invoker resume method , fails:

    public tresponse resume<tresponse>(workflowapplication application, instancestore instancestore, resumebookmarkcontext<resumeoperationrequest> resumecontext,         out idictionary<string, object> outarguments)         tresponse : resumeoperationresponse, new()     {         var response = new tresponse();         outarguments = new dictionary<string, object>();         idictionary<string, object> wfoutarguments = new dictionary<string, object>();          application.instancestore = instancestore;          try         {             application.load(resumecontext.workflowinstanceid);         }          catch (exception exp)         {              //exception happens here          }     } 

at point i'm interested in pointers in causing this.

there seems no way debug , actual cause of problem.

many thanks

the workflow application throws error when put load method in try catch. in application, if put load method call in try/catch, change guid right before calls method , throw exception. fix take out try catch method , add on caller calling method.