error in include chain (cmb_def.h): expected identifier or

This error usually occurs when the compiler encounters an unexpected token or character in the include chain. In this case, it seems like the issue is with the `cmb_def.h` header file.

One possible cause of this error is a missing semicolon or other syntax error in a file that is included before `cmb_def.h`. Check the code in the files that are included before `cmb_def.h` to see if there are any errors.

Another possible cause is a circular dependency in the include chain. For example, if `cmb_def.h` includes a file that also includes `cmb_def.h`, this can cause an error. Check the include chain to make sure there are no circular dependencies.

It's also possible that the `cmb_def.h` file itself has an error. Check the contents of `cmb_def.h` to see if there are any syntax errors or other issues.

Overall, this error message can be caused by a number of different issues, so it's important to carefully inspect your code and the include chain to identify the root cause.