This error can appear for a few reasons.
The game was updatedThis is quite rare but occasionally a game will be updated from 32 bit to 64 bit. If this happens a new trainer will need to be created. If you are sure this is the case please let us know by post in the trainer's discussion or sending us an email by using the Contact Us form below.
The game has a launcher of different bitness
Some games have a launcher that does not match the game's bitness. There is no easy way to know if this is the case but you should go ahead and let the game finish launching then alt-tab and click play again. If the error still occurs this is not the issue.
The game has anti-cheat
If the game has anti-cheat and WeMod is unable to inject you might receive this error. Please check the trainer info for special launch instructions.
None of these solved my issue
If the issue persists and none of the above apply please post on our Community Forums or send us an email using the Contact Us form below.