OpenWrt: 解决 resize2fs 错误 'Invalid argument While trying to add group #1'

This error message indicates that there was an issue when trying to resize the filesystem on the '/dev/sda2' partition. Specifically, there was an error when trying to add a new group to the filesystem.

There could be a few different reasons why this error occurred. One possibility is that there is not enough space available on the partition to add the new group. Another possibility is that there is some corruption or other issue with the filesystem that is preventing it from being resized properly.

To troubleshoot this issue, you may want to try running some disk diagnostic tools to check for any errors or issues with the partition. You could also try unmounting the partition and running the 'resize2fs' command again, as it is possible that the filesystem cannot be resized while it is mounted.

If none of these steps resolve the issue, you may need to seek further assistance from a Linux or filesystem expert who can help you diagnose and fix the problem.