Hello puredancestudio,
Thank you for contacting us. We are happy to help, but will need some additional information. As a test, are you able to add a new widget to the area?
Turning on WordPress debugging may provide a more detailed error message.
Try disabling any other 3rd party plugins you have installed, other than BoldGrid.
Also, review anything you were working on before this started occurring.
Can you provide a link to the site for us to test?
Thank you,
John-Paul