MicroCode Studio is probably pointing to the wrong version of MPASM.
Go to View > Compile and Program Options > Assembler tab ...
The path above the "Find" buttons should be ...
C:\Program Files\Microchip\MPASM Suite - for 32-bit systems
C:\Program Files (x86)\Microchip\MPASM Suite - for 64-bit systems
If it's not, click the "Find Manually" button and point it there.
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