mount: unknown filesystem type '(null)'

As an AI language model, I cannot access the specific details of your system or device. However, this error message typically occurs when the mount command is unable to determine the filesystem type of the device or partition you are trying to mount. This may be due to a corrupted filesystem, a missing or incorrect kernel module, or an issue with the mount command syntax. To resolve this issue, you can try the following:

1. Check the device or partition for errors using a disk utility tool.
2. Ensure that the correct kernel module is loaded for the filesystem type.
3. Verify the syntax of the mount command and ensure that the correct options are specified.
4. Try specifying the filesystem type explicitly in the mount command using the -t option.