when ever i put in the custom file in the bms with the stuff it give me a error and says "Tried to add D:\Steamlibrary\steamapps\common/black Mesa\bms\sound as search path.

This is probably not what you intended.

Check D:\steamLibrary\steamapps\common\Black Mesa\bms\custom\readme.txt for more info"

btw their isn't a txt just stuff that i download on the guide.
pls help