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The error "RuntimeError - can't modify frozen Array" in Rails occurs when an attempt is made to modify an array that has been frozen. To resolve this error, you can try the following steps:

1. Identify the location where the error is occurring in your code.
2. Check if any arrays are being modified or manipulated in the code.
3. If an array is being modified, try to avoid modifying it or create a new array instead.
4. If the array cannot be avoided from being modified, try using the "dup" method to create a copy of the array and modify the copy instead.
5. If the array is being frozen unintentionally, look for code that could be freezing the array and remove it.

In general, it is best practice to avoid modifying frozen objects, as they are designed to be immutable. By identifying and resolving any attempts to modify frozen arrays, your code will be more robust and stable.