Hi there,
I'm having issues completing a hands-on-challenge due to receiving the following error message:

The value of the "to" parameter contains a character that is not allowed or the value exceeds the maximum allowed length. Remove the character from the parameter value or reduce the value length and resubmit. If the error still persists, report it to our Customer Support team. Provide the URL of the page you were requesting as well as any other related information.

I've tried changing all the fields and also tried the challenge in a different browser. 
Does anybody know how to overcome this issue?
Thank you

Hi there,
I'm having issues completing a hands-on-challenge due to receiving the following error message:

The value of the "to" parameter contains a character that is not allowed or the value exceeds the maximum allowed length. Remove the character from the parameter value or reduce the value length and resubmit. If the error still persists, report it to our Customer Support team. Provide the URL of the page you were requesting as well as any other related information.

I've tried changing all the fields and also tried the challenge in a different browser. 
Does anybody know how to overcome this issue?
Thank you

I came across to this message while doing the trailhead exercise. I cannot save an object with shcema builder by dragging the object to the canvas and filling the mandatory fields
.
The full error message: