Sharepoint Error: String exceed value

Hello,
I am trying to modify a new form. It has no code behind it, but if I try to put any fields on it I get the error you see in the screenshot. I have included the console information as well:

Hello @djbeaudin,

The form that you designed, Is it for a large list with many columns and records?
Does this list has a lookup field pointing to a large list?

Actually the list is very small (8 columns, 300 rows)... it does have a lookup but it's for a list of about 3000 records. I have much bigger lists without issues ... bizarre

@djbeaudin,

This is a known problem and it is usually in connection to a very large and complex list with lots of columns, that's why I'm asking for these details.

This is not related to Plumsail Forms, this is caused by limitations of the Modern UI. If you open the default form, most likely you will get the same error.

You can try to remove the lookup field from the form and check if the error occurs, just to make sure that that is the case.

I rewrote it from scratch and it works now. It was working in SP Forms designer. Any way it's all set now. Thank you.

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