Strange error message: clear build plate

I am using a 3D printer provided for the public at a public library here in San Diego.  Two submitted files generated an error message

`clear build plate' and failed to print.  The technicians had no idea how to handle this (and neither do I).  The files appear fine on my Tinkercad browser.

Anyone know what's going on, and what to do about it?  Thanks. --Alan


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