Depending on your system hardware, certain counters might not be available, like CPU Temperature and GPU Temperature.

This can happen for a couple of scenarios:
1) Open Hardware Library (OHL) requires Admin.
2) Your hardware may not be supported by the OHL.

SCENARIO #1:

To run SPM with "Admin":

1) Right-click on the SPM icon.
2) Select Properties.
3) Select the Compatibility tab.
4) Check the "Run this program as an administrator" option.
5) Click the OK button.
6) Restart SPM.

From the OHL Page regarding Admin:
http://openhardwaremonitor.org/downloads/
"...Without Administrator rights most hardware sensors are not accessible...."

SCENARIO #2:
If your hardware is not supported by OHL, you can optionally and temporarily disable the counter. Steps to Disable a Counter:

1) Under the "Tools" menu option, select "Setup Options...".
2) Select the "In-Game Counters" tab.
3) Uncheck the "Enabled" checkbox for the counters you wish to remove.
4) Click "Save".

IMPORTANT NOTE!
Please remember that you can always go back and re-enable any counter at any time.