node from line 0:0 mismatched tree node: UNIT expecting UNIT

Question

What does this error mean? Notice it expected a UNIT node and got what it was expecting...

Phase_2.g: node from line 0:0 mismatched tree node: UNIT expecting UNIT

Answer 1

Oops! I had forgotten the "tokenVocab" part on Phase_2.g.

options {
    (...)
    tokenVocab=Phase1;
}