First thing you should do is run the server without any modifications to make sure the base files are in a good state (make sure you're using a proper start command).
Then, download the official release of
MetaMod for AMX Mod X and then download
AMX Mod X 1.9.0. Then follow the official instructions for installing them.
If you're on Windows, you should use backslashes for folder separators in file paths. You're showing slashes (which is for Linux). Not 100% this matters since I don't have Windows to test it.
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