Error message while trying to copy a workflow

Hello Experts,

I want to copy an approval workflow and I'm getting this error message : PWODecisionStep: Write permission denied for value "CountApprover"

PWODecisionStep: Write permission denied for value "CountApprover".
at VI.DB.Entities.EventUnitOfWork.<PutAsync>d__2.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at VI.DB.Entities.PermissionsUnitOfWork.<PutAsync>d__11.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at VI.DB.Entities.EventUnitOfWork.<PutAsync>d__2.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at VI.DB.Entities.UnitOfWorkImpl.<PutAsync>d__37.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at VI.DB.Entities.DbEntitySink.<PutAsync>d__14.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at VI.DB.Entities.DelayedLogicSaveEntityStrategy.<OnSavingAsync>d__5.MoveNext()

Has anyone experiences something like this? I'm using v 8.1

Thanks in advance.