Read-Only Fields

We have two platforms these are real and test. Both of them have similar fields we checked it with .Net tools.
There is no problem in test platform. However, There is a problem in real platform.When we want to do some process after refresh and generate project, it gives an error. However, it just occuring in real platform not test.
The error is like below. A field have become read-only. For this, error is occuring.

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