ORA-01001: Invalid cursor
 What causes this error?
 How to fix it
This is 100% a program logic problem (unless an Oracle bug, such as bug 6823287). Mostly, you will have either forgotten to code an open statement before using a cursor, or have not noticed that the cursor has been closed and have tried to continue using it. The following checklist may help identify the fault:
- Make sure you have an OPEN statement prior to using any explicit cursors.
- Make sure that you do not have a misplaced CLOSE statement.
- If you need to do a sequence of OPEN...CLOSE...OPEN...CLOSE (perhaps because you need to reset bind variables or to commit updates inside a loop) check your logic flow and make sure there are no fetches between the 1st CLOSE and the 2nd OPEN.
- If you have nested loops, check that a condition in an inner loop is not being missed which allows control to pass unexpectedly to a CLOSE in an outer loop
- Remember that a PL/SQL FOR loop does an implicit OPEN and CLOSE. If you take a routine with a FOR loop and change it to a WHILE loop you must remember to code the OPEN and CLOSE.