Template Custom Property error

I have created a template that I’m using to display motor status. I have tried to add a custom property to the template called “MotorTag” which would be a string variable. I am getting an error:

NullPointerException

Ignition v7.6.0 (b1875)
Java: Sun Microsystems Inc. 1.6.0_45

What is meant by this? I have tried several different configuations, including making it an integer, etc, but always get the same error.

Thanks!

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