Lexmark CS410 Technical Reference Manual page 159

Error message
Unable to open LFM file %s
Variable key/value malloc failed.
XML file missing required attribute: %s
XML file missing required element: %s
Error type
LFM file
Insufficient memory
XML error
XML error
Forms print errors
159
Solution
Missing or corrupt file—
download formsets again.
Add memory to printer.
Possible corrupt file—
download formsets again.
Possible corrupt file—
download formsets again.