Restart your computer to clear out any cached files.
: Third-party antivirus programs (like ESET or Windows Defender) or other VPN clients can sometimes block FortiTray from loading its system extensions. fortitray exe application error
If the error disappears, add FortiTray.exe to the "Exclusions" or "Whitelist" in your other antivirus settings. Restart your computer to clear out any cached files
(all versions 2015-2022).