If your using mods:-

Please send your log file. It can be found at BepInEx/LogOutput.log.
If you are using r2modman or Thunderstore Mod Manager open the folder with 'Settings > Browse profile folder'

If your not using mods:-

Please send your player.log file, It can be found at C:\Users\UserName\AppData\LocalLow\IronGate\Valheim