235: Unexpected tab character in suggestions file

You have linked a suggestions file to a single-line textbox form field. The suggestions file contains a tab character in your case, but tabs are not allowed in a suggestions file.

Solution

Technically speaking, the suggestions file is supposed to be a single-column TSV file. While TSV means tab-separated values, tabs are neither necessary nor allowed in a single-column TSV file: each record comprises one line and contains a single value, hence there are no two values to be separated by a tab.

So make sure that each suggestion for your textbox is on its own line in the suggestions file and does not contain a tab character. Mind that the first line in the suggestions file does not contain a suggestion, but is the TSV nameline. It is basically a column heading.

Take a look at this example with a question and a textbox for the answer, linked to a suggestions file:

Who is your favourite Beatle?
[_]->fab-four.tsv

The content of the suggestions file fab-four.tsv could look like this:

Famous Beatles
John Lennon
Paul McCartney
George Harrison
Ringo Starr