Power Flow Unable to load members in workflow state

When a document is actioned(Approve) and from web it is not going to next state , It show the following error in$WxErrorText field on lotus notes document

POWERFLOW ERROR: Unable to load members."

“FILE: .\SRC\PFROLE.cpp”

“LINE: 367”

There are 5 to 6 workflow stages for application , the work

flow runs smooth from start to 3 stages then it gives the error

Please help

Subject: Have you contacted Power Flow?