The "processor type is undefined" error usually means that MicroCode studio is pointing to the wrong MPASM installation.
In MCS go to View > Compile and Program Options > assembler tab.
The path above the "Find" buttons should read ... c:\program files\microchip\mpasm suite
On 64-bit systems it's ... c:\program files (x86)\microchip\mpasm suite
If the path is different, click the "Find manually" button and point it to the correct folder.




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