Hi Abrar,
Generally this error message is related to the positioning of the signature and only occurs when drawing a signature. The other options include uploading an image of the signature or typing the signature where this error should not occur.
The safest bet would be to try to eSign through the line with a larger signature or get in touch with our 24x7 Support team to see if there is a technical underlying issue.
To get in touch with our Support team, simply click on the '?' sign on the top right-hand corner of your Dashboard where you'll find the 24x7 Telephone Support line, Live Web-chat menu and support email address.
Hope this helps!
Kind regards,