????????????

Hi
Help is needed
I can't make an NC file, a window pops up where it says that the connection with the postprocessor is interrupted, what needs to be done to make it work

N131 M6
N132 S18000 M03
N133 G00 G90 X20.5372 Y0.0
N134 G43 Z7.2593 H2
N135 M08 The postprocessor records a very large value of Z, although the unit costs Z 5mm why and what should I fix?
Mach3

error NCB0260: This machine can't handle multiaxis programs.

why can not write the file?