When you entered your 1099-R for your pension income in your Federal return, did you indicate the 'Source' of the pension as an exempt pension type on the 'Where is this distribution from?' screen. You may want to check your entry there.
If so, this info will flow into your Massachusetts return, so that you don't have to make a direct entry on Form 1 in your MA return. This will clear the error you are seeing.
If you're using TurboTax Online, be sure to clear your Cache and Cookies before returning to the 1099-R entry.
@DDABM
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