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What would cause a "Parsing error: Invalid operation" when programming a Equation Network using ProWORX Nxt?

The most common cause of this error is when you enter the colon ":" after the result register. Chapter 8 of the Modicon Ladder Logic Block Library User Guide (840USE10100) states that the content of the Equation Network is in the form: "result := algebraic expression". Unlike Modsoft, ProWORX Nxt automatically inserts the colon ":" after the result register.
Below is a example of entering a colon ":" when programming a Equation Network with ProWORX Nxt and selecting the "OK" button:



Below is a example after removing the colon ":" when programming a Equation Network with ProWORX Nxt and selecting the "OK" button"
(It was accepted):


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