A white screen of death was encountered which is likely due to a PHP fatal error

hi, i have one question. I have activated an amp plugin but there is an error appearing on choosing transitional mode.
Transitional mode activated! However, there was an error when checking the AMP validity for your site. Unable to validate URL. A white screen of death was encountered which is likely due to a PHP fatal error. Please check your server PHP error logs; to do this you may need to enable WP_DEBUG_LOG. If you are stuck, please search the support forum for possible related topics, or otherwise start a new support topic including the error message, the URL to your site, and your active theme/plugins. Please include your Site Health Info.

This is website url : https://www.creativesystems.com/

this is error log i get from server

[15-Jun-2020 13:58:00 UTC] PHP Notice: Undefined variable: infographics in /data/58/1/110/57/1925546/user/2098275/htdocs/wp-content/themes/creative_system/footer.php on line 12
[15-Jun-2020 13:58:00 UTC] PHP Notice: Undefined index: btnsubmit in /data/58/1/110/57/1925546/user/2098275/htdocs/wp-content/themes/creative_system/footer.php on line 128
[15-Jun-2020 13:58:01 UTC] PHP Notice: Array to string conversion in /data/58/1/110/57/1925546/user/2098275/htdocs/wp-content/plugins/amp/includes/sanitizers/class-amp-style-sanitizer.php on line 3405
[15-Jun-2020 13:58:01 UTC] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 2097160 bytes) in /data/58/1/110/57/1925546/user/2098275/htdocs/wp-content/plugins/amp/vendor/sabberworm/php-css-parser/lib/Sabberworm/CSS/Parsing/ParserState.php on line 307
[15-Jun-2020 13:58:01 UTC] PHP Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
[15-Jun-2020 13:58:21 UTC] PHP Notice: Undefined variable: infographics in /data/58/1/110/57/1925546/user/2098275/htdocs/wp-content/themes/creative_system/footer.php on line 12
[15-Jun-2020 13:58:21 UTC] PHP Notice: Undefined index: btnsubmit in /data/58/1/110/57/1925546/user/2098275/htdocs/wp-content/themes/creative_system/footer.php on line 128

please help me in resolving this issue.

• This topic was modified 4 years, 5 months ago by franks123.