how to setup a custom sensor i keep getting errors. like invalid JSON.

Kind PRTG users,

i am trying to build a script to show me the enabled users in a active directory. i use the following command: (get-aduser -filter *|where {$_.enabled -eq "True"}).count this wil give me a value like 178. But when i put the script underneath together it wont work. I get a The returned json does not match the expected structure (Invalid JSON.). (code: PE231) error. I also get this with another script about windows backup. What is wrong with my script?

$value = (get-aduser -filter *|where {$_.enabled -eq "True"}).count
<prtg>
  <result>”
    <channel>usersenabled</channel>”
    <value>$value</value>”
    <LimitMaxError>200</LimitMaxError>”
    <LimitMode>180</LimitMode>”
  </result>”>
</prtg>

when i look at the log it gives me the following:


The term 'get-aduser' is not recognized as the name of a cmdlet, function, scri
pt file, or operable program. Check the spelling of the name, or if a path was 
included, verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:1 char:21
+ $value = (get-aduser <<<<  -filter *|where {$_.enabled -eq "True"}).count
    + CategoryInfo          : ObjectNotFound: (get-aduser:String) [], CommandN 
   otFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:2 char:2
+ < <<<< prtg>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:3 char:4
+   < <<<< result>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:4 char:6
+     < <<<< channel>usersenabled</channel>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:5 char:6
+     < <<<< value>$value</value>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:6 char:6
+     < <<<< LimitMaxError>200</LimitMaxError>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:7 char:6
+     < <<<< LimitMode>180</LimitMode>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:8 char:4
+   < <<<< /result>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 
The term '<' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included,
 verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom sensors\EXEXML\activeuser
sAD.ps1:9 char:2
+ < <<<< /prtg>
    + CategoryInfo          : ObjectNotFound: (<:String) [], CommandNotFoundEx 
   ception
    + FullyQualifiedErrorId : CommandNotFoundException
 

could this be possible because i run it from a server without any active directory?