Gamemode Problam

I made a Garry’s Mod 13 Sandbox server and want to make a Garry’s Mod 13 DarkRP server. I have everything installed but the gamemode won’t change. I have a server_startup.bat file to start the server and this is what the file looks like:

@echo off
echo Protecting srcds from crashes…
echo If you want to close srcds and this script, close the srcds window and type Y depending on your language followed by Enter.
title Watchdog
echo (%time%) srcds started.
start /wait srcds.exe -console -game garrysmod +map gm_construct +maxplayers 16 -port 27015 +gamemode "DarkRP"
echo (%time%) WARNING: srcds closed or crashed, restarting.
goto srcds

I get this error in the console of the server startup and it loads to Sandbox.

Couldn’t change active gamemode - ‘DarkRP’ not found

some one can help me please?

Remove the “” from the start-up line and lowercase DarkRP (darkrp). Do the same with gamemode folder.

Thank you!!!