% linuxcnc
LINUXCNC - 2.5.0
Machine configuration directory is '/usr/local/src/emc2.trunk/configs/emccalib_tst'
Machine configuration file is 'etch.ini'
Starting LinuxCNC...
af: 0 .main.top.fpage0 1 .main.top.fpage1
0 {setp encoder.0.position-scale [AXIS_0]INPUT_SCALE}
0 {setp [SUBSTITUTE](PID).[SUBSTITUTE](ZERO).Pgain [AXIS_0]P}
Error in startup script: Invalid argument
    while executing
"hal getp [halcmdSubstitute $thishalcommand]"
    (procedure "makeIniTune" line 46)
    invoked from within
"makeIniTune"
    (file "/usr/local/src/emc2.trunk/tcl/bin/emccalib.tcl" line 478)