Issue while creating Sequential Workflow

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While creating a Sequential Workflow i am getting the following error. Can any one help me on this?????

To serialize an object the object has to have a schema (or inherits from IDictionary or IList) for type:System.Collections.Generic.List`1[[EPiServer.WorkflowFoundation.Workflows.ApproverItem, EPiServer.WorkflowFoundation, Version=6.1.379.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7]], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 for base type:EPiServer.WorkflowFoundation.CompiledWorkflowDefinition, EPiServer.WorkflowFoundation, Version=6.1.379.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7

#51101
May 24, 2011 13:15
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