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Unable to use ADD function

Hi, I am unable to calculate the total cost if I perform the following:
Total Cost: [ADD [[showVar=costC1], [showVar=costC2], [showVar=costC3], [showVar=costC4], [showVar=costC5], [showVar=costC6], [showVar=costC7], [showVar=costC8], [showVar=costC9], [showVar=costC10], [showVar=costCW], [showVar=costCN], [showVar=costG1]]]

However, I am able to calculate the total cost if I perform addition of 2 factors:
Total Cost: [ADD [[showVar=costC1], [showVar=costG1]]]

What is happening?