Error 11 appears when I try to create a graph. DigiPro1 used to work fine, but not now. What’s wrong?

Answer: Error 11 is caused by a problem in your data file, usually a missing instrument constant. Open your database with DMM. Click on an installation, then click the survey list tab. Check every survey has an instrument constant. The survey that is missing the constant is causing the problem. Use Edit/Add to enter the constant.