offset

Hi All Hoping someone can shed some light on this. I'm using the esl text tags in a document i'm uploading. My package json which works fine. The problem i have is when i put a negative offset - {{*esl:signer1:textfield:offset(10,-10)}} it gives me this error - "{"messageKey":"error.internal.default","technical":"error.eslx.texttagValidation.propertiesFormatError [#5ef99515-ce17-4bef-8fb5-e70f17d12f72]","message":"Unexpected error. We apologize for any inconvenience this may have caused you, please try again.