ORA-04608: Existing state of packages has been discarded ORA-04061: existing state of package body

Hi

The users are getting below error message when trying to approve the invoice through email notification. When the same is approved through the Application, the approval is working fine. The response error message is attched.

Warning: Your previous response to this message was invalid (see error message below). Please resubmit your response.
Error Message: ORA-04061: existing state of has been invalidated ORA-04061: existing state of has been invalidated ORA-04061: existing state of package body "APPS.MAN_AP_INV_APPR_WF_PKG" has been invalidated ORA-04065: not executed, altered or dropped package body "APPS.MAN_AP_INV_APPR_WF_PKG" ORA-06508: PL/SQL: could not find program unit being called: "APPS.MAN_AP_INV_APPR_WF_PKG"