Please show us the code on that line.

Open it with Chrome , browse the form to provoke the error, press F12, search the code on the debug window.

Not sure how far down the development path you are on, but if the forms designer will not open for you, I would make a copy of my list/library and start over. One thing with SharePoint, you need to pick your battles and it might be faster to start over VS troubleshoot this issue.

If this is happening with an Out of the box Nintex form, I would open a ticket with them because something screwy could have happened when you installed the APP or try to delete the app and reinstall it on your site.

Thanks Fernando and Ben for the response.

I wondered if there was an easier workaround, but I guess starting over may be fast resolution in this case.

I will just start over. 

Thanks again.

Hi! If your question is answered, please mark the most correct answer as correct

Regards,

Tomasz

Hi, I facing the same problem also. But, starting over is not an option for me because the

1. the system is on live,

2. the system is use more that few months to build, its insane to start over.

below is where the error occur.

Response message:-

{"correlationId":"c141961e-ecd4-460a-a679-1b8cfaa4c771","dateTime":"2017-10-06 02:27:14","message":"'u001c', hexadecimal value 0x1C, is an invalid character. Line 123, position 631549.","stackTrace":"Exception FullStackTrace:u000du000a----------------------------------u000du000aType: System.Xml.XmlException, Message: 'u001c', hexadecimal value 0x1C, is an invalid character. Line 123, position 631549., StackTrace:    at System.Xml.XmlTextReaderImpl.Throw(Exception e)u000du000a   at System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars)u000du000a   at System.Xml.XmlTextReaderImpl.ParseText()u000du000a   at System.Xml.XmlTextReaderImpl.ParseElementContent()u000du000a   at System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace)u000du000a   at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)u000du000a   at System.Xml.XmlDocument.Load(XmlReader reader)u000du000a   at System.Xml.XmlDocument.LoadXml(String xml)u000du000a   at Nintex.Forms.FormsHelper.IsTagExistInXml(String xml, String tagName)u000du000a   at Nintex.Forms.FormsHelper.XmlToObject(String formMarkup)u000du000a   at Nintex.Forms.SharePoint.NfWcfServices.GetFormObj(String formXml)u000du000a----------------------------------u000du000a","tenantId":"730b7598-4a10-4bbd-a945-4270b2a8e533"}

Please help if you have any better solution.

Thank you.

In that case I suggest contacting Nintex Support, as there are no possibilities to fix it from the UI perspective. 

Possibly they are able to fix it for you from the backend.

Regards,

Tomasz