"CRM2011WorkflowUtilities_3_1_0_0_target_CRM_7.0_managed.zip" solution import failed with error

May 11, 2016 at 2:09 AM
I am trying to import the solution "CRM2011WorkflowUtilities_3_1_0_0_target_CRM_7.0_managed.zip" in my CRM 2015 on-premise environment. It failed with an error "Unable to retrieve security descriptor for this frame." at plugin assembly item type.
Please help me to sort this out. Thanks in advance.