and you are using latest Animate 2020 (20.5 update) ?
what's the macOS version?
Meanwhile as its most likely happening due to anwidget.js file (which doesnot change), could you please try following: once you get successful working output , go to components > sdk location and make the anwidget.js file Read Only , then on subsequent test movie this file should not overwrite and hence no TextInput error. Please try and see if it helps.
Ah, I believe I figured it out! I was trying your suggestion of locking the anwidgest.js file, but for some reason it wouldn't stay locked. I would lock it and it would immediately unlock again. I thought maybe this was happening because the files are in a directory that syncs to Dropbox, so I moved the file out of Dropbox and was able to successfully lock the file. This made me think the entire issue may be because the files are syncing to Dropbox, so I moved the files to my desktop and tried testing the file from there. I tested it multiple times and could not replicate the error, so I'm assuming that must be the issue. I guess I need to move the folder out of Dropbox while working on it, and then move it back when I'm done.