How to solve Silverstripe User error Uncaught InvalidArgumentException? - silverstripe

I am getting error message in silverstripe
[User Error] Uncaught InvalidArgumentException: Unable to parse string: Malformed inline YAML string ({count} {class} saved successfully.).
I have added screenshot of error page.

Thanks guys for your reply. it was a YAML parser error. There was a bug in the 'gridfield-bulk-editing-tools' module, I got a help from silverstripe forum

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I had the same issue here and it was caused by a WordPress update failure where some files were missing or corrupted.
I quickly resolved just reinstalling WordPress. In my case I used FTP, as in this guide: https://kinsta.com/blog/reinstall-wordpress/
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Thanks in advance!
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