You may have a problem with a loaded extension.
This error may be due to a server problem.
Information on error BLZ51900002
If you receive errors when loading your hero, try the following steps to solve the problem
Troubleshooting steps for this StarCraft II error.
Information on Error 101.
World of Warcraft couldn't locate a game account for its region.
Information on Error #114
Troubleshooting an issue where Malfurion will not allow access to Cenarius in the Emerald Nightmare.
Troubleshooting steps for StarCraft and StarCraft: Remastered crash errors