W3cache plugin warning error in log

Hi there,

We have currently noticed the site downtime. Additionally, in the error log, we identified some errors that may have contributed to the downtime. See the screenshot below:
https://drive.google.com/file/d/1XJvGhufFccVJ-KF4fR04iB0_la9bCy3t/view?usp=sharing

https://drive.google.com/file/d/1zvl0BH4q-Rq97fqr8P4oDHtMIOktHnlb/view?usp=sharing

We also checked all the file permissions, and the path mentioned seems to be 755, which should not have caused the issue.

Could you please review and let us know what the possible case might be, and provide suggestions or insights to resolve this issue in the future?

Any help would be highly appreciated. Looking forward to your response.

Thanks

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