I have created a custom workflow activity and it is coming fine in the designer.

As soon as I publish my workflow, I get below error

(0, 10) The type or namespace name '

For this, where do I need to add my DLL's so that they are accessible?

I have added the web.config entry which is there at "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\CONFIG". Tried adding it before and after TargetFx but no help.

2 Answers 2


Try deploying the Activity dll to GAC.

To use custom activity in Workflow, you need to deploy the activity to the GAC.


Deploy the Activity dll to GAC and restart visual studio. Restart is important, othervise it's not working.

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