Output buffering issue

  • I installed this plugin yesterday when I had 3 posts online, but today I uploaded a few more test posts on my website and suddenly I got this error:

    Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

    My sidebar doesn’t want to show up anymore. I chose to show 3 thumbnails/popular posts in sidebar.

    Could anyone help me – how can I solve this issue?

    https://www.ads-software.com/plugins/popularity-posts-widget/

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