Hello and welcome to the community. 
Issues with correctly loading the WeMod software or issues with logging in are usually related to interference from security programs on your PC or network. Amongst other things.
Firstly, restart both your PC and router.
If there’s no change, then check out this troubleshooting post and give all the steps a go: I can’t Install WeMod / "There was a error installing the application" - #2 by Ravenfyre. The title is a little different to your specific issue, but the steps are all the same.
@tarapotamus - While I appreciate you helping, please take the time to read posts before replying. They are clearly not the same issue. You’re having an issue with a game freezing while using a trainer, the OP is having an issue with WeMod logging in correctly.