Gmod Server Freezing

I launch my server and it freezes after “Nav File is wrong or something (1)” this can also be a “(4)” too.

Here is my start.bat script:
@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 srcds Watchdog
echo (%time%) srcds started.
start srcds.exe -console -game garrysmod +exec server.cfg +map gm_construct +maxplayers 1 -gamemode terrortown
echo (%time%) WARNING srcds closed or crashed, restarting.

I have searched everywhere but can’t seem to find a fix; help would be greatly appreciated.
Thank you!