issue while executing. 

I am gettng below error for below command.
#check_lvm_usage.py -vg xenvg -lv 5a2cbb69-3a58-4f71-b8d8-77eb0f00e9bf.disk0

Traceback (most recent call last):
  File "check_lvm_usage.py", line 66, in <module>
    compare(lvmeta,ARGS.warning,ARGS.critical)
  File "check_lvm_usage.py", line 53, in compare
    if float(value) >= float(climit):
ValueError: could not convert string to float: 
