So in the SQL code which you run, you are apparently trying to squeeze in something which is longer than 100 characters in something that only fits 100 characters. (And the message only shows the truncated value.)
To find out where this might be happening, you could set up an extended-event session which captures exceptions and also captures the statement. I have article on my web site, Monitor Exceptions in Your Database, which shows how to set up such a session, and which also includes a view to easily query the output from the session.