I'm getting the following error when trying to calculate a field:

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I'm just trying to calculate all the selected records to equal a value I specify, a simple two-letter zoning code. So the field calculator expression is simply field = value (I'm not trying to make it equal another field or use a mathematical espression). The field is string type, length 10, which should be long enough for two letters. The field does not have a domain assigned to it. I get the same error whether I'm in an editing session or not. This should be easy - what's going on?

  • Could you provide screenshots of both involved field's properties?
    – Louis
    May 16, 2017 at 20:00
  • 1
    I figured it out. I simply needed to add double quotes around the specified value. Still, the error message was misleading and confusing me. May 16, 2017 at 20:02

1 Answer 1


If it's a string value (which it sounds like it is since you said two-LETTER zoning code), you need to put quotation marks around the value like: field = "value".

  • Yeah, that was kinda stupid of me to overlook something like that...thanks. May 16, 2017 at 20:16

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