Powershell and Set-VHD

so i'm learning powershell amongst other things work. 

but 1 thing has caused me grind stop face set-vhd worked me no more week ago. last day or 2 literally stopped working , have no idea why.

the error gives me follows:

set-vhd : term 'set-vhd' not recognized name of cmdlet, function, script file, or operable program. check spelling of name, or if path included, verify that 
the path correct , try again.
at path.ps1:20 char:1
+ set-vhd -path "path" -parentpa ...
+ ~~~~~~~
    + categoryinfo          : objectnotfound: (set-vhd:string) [], commandnotfoundexception
    + fullyqualifiederrorid : commandnotfoundexception

file paths are definitely correct.

can me understand why stop working out of blue?

if don't have hyper-v module it'll fail, or if you're running powershell 2.0 , haven't run:

import-module hyper-v

before running command.

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hope helps! jason

Windows Server  >  Windows PowerShell