“Plugin does not have a valid header” error

  • Hi, I am trying to upload the Cryout Serious Theme Settings plugin to my site. I have Nirvana activated as my theme. I am using WordPress 4.9.4, Nirvana 1.4.4 and the plugin’s latest version, 0.5.9. I can upload the plugin successfully, but I receive the error, “This plugin does not have a valid header,” after I click Activate.
    I have followed the instructions on the minimal step-by-step tutorial for debugging. I have no other plugins on my site. I have tried to upload the plugin via ftp, and install the plugin from wp-admin. I have tried to check the files to make sure there isn’t a duplicated folder, or mistakes in the beginning of the files. I am still seeing the error. What else can I try?
    Also, I see that the recommended version of the plugin on the Appearance> Nirvana Plugins page is the 0.5.1 version, not the current version of the plugin, 0.5.9. I also have tried to install that version, without success.
    Thank you for your time. The Nirvana theme is wonderful!!

    The page I need help with: [log in to see the link]

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