syntax error near unexpected token `(' error during stitching Windows XP

[earthsound]

When I attempt to stitch (via "Save project and send to batch" or "Stitch now..."), I get an error as follows:

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System information
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/usr/bin/sh: -c: line 0: syntax error near unexpected token `('
/usr/bin/sh: -c: line 0: `echo Operating System: Windows XP (5.1 Service Pack 3)'
make: *** [info] Error 2

I'm attaching the .pto and .pto.mk files, though I [censored] the user name out of the paths in the .pto.mk file.