Read the newbee threads, 16F877A no go.

[NavMicroSystems]

I'd be willing to make a small wager, perhaps a drink, that if another assembler were selected the same mistake would produce a different error.

For sure, different systems produce different (nonsense) Error Messages.

The best one I have ever seen was:

A Nonexistent error has occured in Module xxxxx at Address yyyy

(Guess what: It was Intel Hardware running a Microsoft OS . . .)