Fortran Module Version Fatal Error - module

Question

I have a very scary error on Fortran 95:
Fatal Error: While reading module 'list5.mod' found module version 0, expected 6
I have included the main structure of my module. I highly doubt it has anything to do with the substance inside my module since it has given me error messages on those and I have been able to fix them which means it is able to go through my module fine it is just something small related to the way I use the module. Perhaps?
MODULE list5
IMPLICIT NONE
CONTAINS
----
END MODULE
The main program is structured something like this:
PROGRAM mainlist
USE list5
IMPLICIT NONE
!Variable Declaration
INTEGER:: opt
INTEGER, PARAMETER:: maxitems=50
INTEGER:: size=0
CHARACTER(20):: itemarray(50)
INTEGER:: quantityarray(50)
INTEGER:: totalquantity, i=0
REAL:: totalprice=0, pricearray(50)=0
CHARACTER(20), DIMENSION(:)::Item
CHARACTER(20):: ItemSought
LOGICAL:: Found
INTEGER:: Location
INTEGER:: NumItems=0, SmallestItem=0
!Select statement for the menu
DO
opt=choices()
SELECT CASE (opt)
CASE(1)
size=size+1
CALL getItemData(itemarray,pricearray,quantityarray)
CASE(2)
CALL getFileItems(size,itemarray,pricearray,quantityarray)
CASE(3)
CALL pickItemRandomly (size)
CASE(4)
CALL calcListTotals
(pricearray,quantityarray,totalprice,totalquantity)
CALL printList(size,itemarray,pricearray,quantityarray,totalprice, totalquantity)
CASE(5)
CALL sortByItem(itemarray, pricearray, quantityarray)
CASE(6)
CALL sortByPrice(itemarray, pricearray, quantityarray)
CASE(7)
CALL writeListtoFile(size,itemarray, pricearray, quantityarray)
CASE(8)
CALL search(itemarray, ItemSought, Found, Location)
CASE(9)
STOP
END SELECT
END DO
END PROGRAM
Any suggestions at all?? I really need to solve this so any help would be appreciated. Thanks so much!!

Answer 1

As Rook says, the issue is with compiler versions; somehow the .mod file from by compiling list5 the first time around was generated by an older compiler. Clear out all your .o and .mod files, and try again, first compiling list5.f90 (or whatever the file containing module list5 is) and then compiling the main program.