Need help with gmod 13 beta srcds

So i have this line is srcds: C:\SRCDS\games3\orangebox\srcds.exe -console -game garrysmodbeta -port 27015 -tickrate 66 -maxplayers 8 +map gm_constuct but when i launch srcds4 (the name of my gmod 13 beta server) and it says Failed to load launcher.dll. What should i do?
~JK

please help me

Try the gmod13 beta sub section.