I upgraded a set of SSIS packages from SSIS 2008 R2 to SSIS 2012 and all of them had a smooth upgrade except for one. I had script tasks in almost all the packages which ran succesfully after I upgraded and tweaked them.
There was one package which was giving me trouble and functionally it dealt with moving, loading and deleting files from various folders. I upgraded the script task, updated all references, modified the project paramaters (as I am using the Project Deployment Model) and when I tried to run the package (Debug mode), the following generic error popped up:
Exception has been thrown by the target of an invocation.
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript()
This error message was very generic and did not help me in tracking down the root cause. I decided to put a breakpoint into the Main() method of my script and tried debugging the package again. I was surprised when the script task opened up in VSTA and reached my breakpoint (which contradicted the generic error message – Invocation Error). The issue was with folder security to access the files.
Hope this helps fellow ETL developers who might come across similar issues with a generic invocation error.
The No-Brainer Lab 
Hi,
I’m facing the same issue, did you find how to fix this problem?
Regards,
Gadi
Hi,
The solution mentioned in my post above worked for me. Debug your Script task line by line to identify the cause.
Cheers,
Mohamed
Thanks, my problem was I did’t registered my assembly in the GAC.
Gadi
Great. I’m glad you discovered the root cause.
And my problem (with this same exact error message) was just that I had a typo in the server name I was trying to connect to. But the breakpoint and drilling down to the inner error revealed it. Thanks.