We need System logs to know more about vg01, but you can see in the above link that it ask to choose the correct volume group, and as you say you already use(choose) vg00, try to unselect the vg00 and reselect it.
From the console: Press CTRL-ALT-X , Use the option Select Default Volume Group

Also if you did not do any File system repair, please run a FSR to check that your file system has no issues, read this link to know how to run FS repair:
http://kb.open-e.com/File-system-repair_138.html


Also if you are using a snapshots from this LV, try to remove them in Extended tools from the Console mode : CTRL + ALT + X then select remove snapshots, then restart the system.

Also I recommend you to check the RAID Controller health, and to update it's firmware.