Issue with mobile and cache for index

  • I recently changed my home page and am now getting an error on mobile that references the plug in. I deleted the plug in but still having error.

    “Notice: Undefined index: If-Modified-Since in [path of server /plugins/WP-super-cache/wp-cache-phase1.php on line 235”

    AND

    “Warning: Cannot modify header information – headers already sent by (output started at [path of server/plugins/WP-super-cache/wp-cache-phase1.php on line 247”

    Help! Thanks

    https://www.ads-software.com/plugins/wp-super-cache/

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