from the error .bmp name, I could say u try to edit iteminfo.lua but the encoding might has been broken maybe ? try with original iteminfo.lua that didnt being edited yet.
Make sure you edit the iteminfo,lua with correct encoding.
need to git commit for current changes if you didnt done it yet, and also git pull to latest rathena.
I didnt know whether this video might help or not but its similar to this.
this error is for sure to remove or delete dbghelp.dll.
About the failed to connect server, its because of another reason. Maybe the server down, its not connecting to server, firewall, etc.