Adding Custom shows blank error message

Hi,
I am trying to add a custom meta field from setting -> custom .
I have enter the name of custom meta data and added a field in it. But when i press the SAVE button it doesn’t save and shows me
a error alert (popup) message. The alert message screen is blank. Still it doen’t show what is the Error.

Thanks.

Do you see an error in the error log?

Hello oferc,
Have you checked this issue, I am still facing this…

Thanks Man.

Hello oferc,
Have you checked this issue, I am still facing this…

Thanks Man.