Encoding error message when submitting form to REST endpoint

when submitting stand-alone form rest endpoint of process receive following message in acrobat reader (translated german):

"an error occured when submitting form. content of type text/plain;charset=utf-8 not processed"

despite error message process gets started , works fine.

in terms of usability rid of error message since irritates ordinary user.

this happens in acrobat reader (version 10.1) not in pro

my workbench version 10.0.1

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