I've had this problem before but I don't exactly remember what was causing it, I think it was a malformed config. Try renaming the "cfgs/sourcemod" folder and starting the server. See If that fixes it. You could try using the "
Cvar Configs Updater" plugin with the cvar set to comment out default values. If either of those work, slowly start adding/overwriting the previous configs until you find the one causing it.
Since the first output is from "l4d2_cola" I would try looking at that config and see if it's missing a " or the comments are wrong or deleting it entirely and letting the plugin generate again.
Please let us know what the issue was and how it was resolved.
Edit: I just recalled I think it was a bad character within one of the configs. This happened to be from one of my plugins a while back, I don't recall if that issue was present in the released version or just a bad config I had setup. If the plugins of mine are from an old backup or something, I suggest grabbing my "Plugin Updates Checker" plugin and verifying you have the latest plugins of mine and then I would recommend the "Cvar Configs Updater" to make fresh configs whist retaining your previous settings. Although if it is a config issue that might break somewhere, so please let me know if that's the case.