It seems like a fetch has been attempted in your code from the cursor when the cursor is no longer valid. A PL/SQL cursor loop implicitly does fetches and can cause this error.
1) Are you fetching from the cursor even after the last row is retrieved and ORA 1403 error is returned? If that is the case, do not issue a fetch after the last row is retrieved.
2) Is the cursor opened with the FOR UPDATE clause? If so, then if a COMMIT statement is inside the loop, fetching after the commit may return the error. Do not issue a COMMIT inside the fetch loop.
3) Are you rebinding any placeholder variables? Then issuing a fetch before re-executing the statement can return the error. So, what you need to do in that case is, re-execute again after rebinding AND then fetch.
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