Hello everyone,
We have seen multiple reports of a script error related to Photoshop and the following workarounds have fixed it for many users.
1) Uninstall (remove preferences) and Reinstall Photoshop
Disclaimer: Please note that renaming preferences folders will remove all the custom settings, and Illustrator will launch with default settings. You can also save a backup of the folders, the location of which is mentioned here.
2) Open the JSX file in a text editor, which is available at
"/Library/Application Support/Adobe/Startup Scripts CC/Adobe Photoshop/" for macOS
"C:\Program Files (x86)\Common Files\Adobe" and "C:\Program Files\Common Files\Adobe" for Windows
Add } in the last line, save the JSX file, and relaunch Illustrator.
Also, could you please upvote this UserVoice (https://illustrator.uservoice.com/forums/601447-illustrator-desktop-bugs/suggestions/49667915-error-in-startup-script-line-2798-no-matching) and add your comments there. Doing this will help us prioritize this request, and you will be notified of any updates.
Please let us know if you are still having trouble with this, and we will do our best to help you.
Anubhav