Why Plugin not working when I stopped profiling the step in plugin registration tool?

In plugin registration tool, I have:-

1. Registered an assembly (dll of my plugin assembly)

2. Registered a step

3. Started profiling on this step

4. Attached my plugin to Plugin registration tool( using Attach to Process in visual studio)

5. Started debugging,

My plugin worked as expected.

But when I stopped profiling, it started giving me error as below:-

And the plug-in trace log is as follows:-

Unhandled Exception: System.Runtime.Serialization.SerializationException: Element 'schemas.datacontract.org/.../System.Collections.Generic:value' contains data from a type that maps to the name 'System.Collections.Generic:Dictionary`2'. The deserializer has no knowledge of any type that maps to this name. Consider changing the implementation of the ResolveName method on your DataContractResolver to return a non-null value for name 'Dictionary`2' and namespace 'System.Collections.Generic'.

Please help me.