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.

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