Payment modules (and shipping modules) come in pairs of two files per module: the logic module file and its corresponding language file. Both share the same filename, but their contents are different and the files are stored in different locations.
If there is a mismatch such as one file is present but the other is missing, or if you've put them in the opposite places, or if you've copied one of the files to both locations, naturally it won't work ... sometimes resulting in the error message you first posted, or resulting in no module being displayed, such as your latest post, or a fatal error happening which stops the site from working or stops "the rest of the list of modules" from appearing in the admin, including the add/remove sidebar.


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