Pencil Animation this error occurs while exporting a new project

Hello experts,
Pencil Animation this happens every time while exporting a new project. Can anyone provide me the solution to resolve this annoying error? I really need your help to demolish this error. Thanks in advance.

Flood fill Error
Sorry! This doesn’t always work. Please try again (zoom a bit, click at another location.. )
If it doesn’t work, zoom a bit and check that your paths are connected by pressing F1.).
Error: Could not find the root index.
OK
