I was having the same issue also.
I uninstalled everything WoT related(OMC ModPack, Warpack, WoT) and installed a fresh WoT Client. The game ran fine, so downloaded and installed Warpack, then ran it. Everything worked.
Then I ran into issues after trying to add my mods back, OMC seems to cause the conflict for me. So, if you can get by without mods until they sort out the problem, that might be your only option.
I uninstalled everything WoT related(OMC ModPack, Warpack, WoT) and installed a fresh WoT Client. The game ran fine, so downloaded and installed Warpack, then ran it. Everything worked.
Then I ran into issues after trying to add my mods back, OMC seems to cause the conflict for me. So, if you can get by without mods until they sort out the problem, that might be your only option.