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Newbie - Entering a number into a number field gives me and error message

Question asked by ElizabethCasteel on Jan 23, 2019
Latest reply on Jan 23, 2019 by user19752

"This action cannot be performed because this file is not modifiable."

I am new to FMPro and am creating files. So far so good except I get the error listed above when I try to type a number into one of my number fields. I checked that the settings are correct in the data tab. I am the only one who had access to this database. it's trial and error. Ok, it's hard! My mac has read and write for the file and FM. Not sure what to do. I'd be happy to send the file if someone wanted to look at it.