I don't see a reason then.

Do you have the correct chip selected in the Device Drop-down in MicroCode Studio?

Does this program (that compiles here with PBP 2.60/18F252), give you the same error?

Code:
Addr  VAR BYTE
Value VAR BYTE

Addr = 0
Value = 123

WRITE Addr, Value
READ Addr, Value
LCDOUT $FE,1,"Addr=",DEC Addr,"  Value=",DEC Value
STOP
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