Powershell output

Here's my script:

$state = get-wmiobject MSCluster_Node -computername sqlserver1 -namespace ROOT\mscluster -authentication packetprivacy | Where { $_.nodeinstanceid -match "00000000-0000-0000-0000-000000000001" } | foreach { $_.state}

write-host
"<prtg>"
  "<result>"
    "<channel>State</channel>"
    "<value>$state</value>"
  "</result>"
"</prtg>"

Exit 0

when I run the script on the probe the output is as follows:

<prtg>
<result>
<channel>State</channel>
<value>0</value>
</result>
</prtg>

However, the sensor fails with the error below:

Error reading response: Invalid XML (missing /prtg)
No Channels Received

custom powershell script xml