C_Sign returned CKR_OPERATION_NOT_INITIALIZED in multithreaded application

[Anil-Kamble]

Hi,

We are signing the PDF using multi threading. Sometimes it's throwing error "C_Sign returned CKR_OPERATION_NOT_INITIALIZED" & "C_SignInit returned CKR_OPERATION_ACTIVE"

It will be great help, if anyone could guide us to resolve it.

Stacktrace is also pasted below for reference.

at Net.Pkcs11Interop.HighLevelAPI41.Session.Sign(IMechanism mechanism, IObjectHandle keyHandle, Byte[] data, Boolean performLogin, Byte[] keyPin)
at Net.Pkcs11Interop.HighLevelAPI41.Session.Sign(IMechanism mechanism, IObjectHandle keyHandle, Byte[] data)