Cannot extend disk with vmkfstools -X

Hi All,

I have a primary disk that need extending but I do not sem to be able to use the vmkfstools -X command without the following error:

I have also tried the full path to the file. from the rout and doing it from the directory the file is stored in. Can someone please confirm if this is a problem with spaces in file names or am I just not doing it correctly?

Thank you,

Peter