Corrupted Talent Strings

Errors/warnings about corrupt talents or talent strings that cannot be decoded can be the result of old/bad talent strings or, sometimes, can be because your computer is infected with crypto malware.

Bad Talent Strings

If you have some old talent loadouts from previous patches, it's possible those loadouts are out-of-date. Try deleting those loadouts and then recreating them to see if the problem persists.

If you are running a talent loadout manager addon, you may also need to check those loadouts as well.

This will solve the majority of bad talent loadout issues.

Malware

In some cases, your computer may have malware that is looking for wallet addresses and then replacing them with one of their own. This kind of malware is trying to steal crypto transactions by sneakily replacing the wallet address with one of their own and it happens while you are copy/pasting and might not notice.

Why in the world is this relevant to Raidbots/WoW? Because some talent loadout strings look very similar to some types of wallet addresses. The malware changes the talent string when it gets pasted into Raidbots trying to stuff in the malicious wallet address. And in most cases, that wallet address is not a valid talent build. Even if it was, the change that it would be a good talent build is very low.

Identifying if it's Malware

A quick test to determine if something is messing with your talent strings is to copy your /simc input from the game and paste it into a text editor like Notepad.

Open up /simc again in-game but do not copy. Find the talents=  line that is being flagged as invalid and compare against the long string you pasted into Notepad. If the strings differ, something on your computer is silently rewriting your clipboard contents.

Removing Malware

If you can confirm that malware is rewriting your talent strings, there are some basic steps you can take to try to remove it.

1. Download and run a trusted malware removal program. Malwarebytes, ESET Online Scanner, or Hitman Pro. Run their scanners and follow any instructions for removal.
2. If you use Chrome, open chrome://extensions and chrome://policy and remove anything that you don't recognize. If you are on your own personal computer, also look out for anything marked as "managed by your organization" - this can often be malware if it's not a corporate/managed computer.
3. Try uninstalling Chrome completely, delete your user data folder, restart, and install from scratch.
4. Try using the built-in Windows virus protection in Settings > Privacy & Security > Windows Security > Virus & threat protection. There is a Microsoft Defender Antivirus (offline scan) option which is particularly good since it restarts your machine in a safe mode to try to remove threats.