I have experimented all solutions from previous issues but can't solve problem.
Please help!

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This could be that the postprocessing of the pbxproject file did not complete successfully. You can check the Unity console log for this.
Make sure you are:
this needs to be a sticky; ran into this again and the checklist fixed it for me.
thanks.
This seems to come back every time "append" from the Unity build is no longer an option. After the checklist failed me, I tried @integer222's fix this time, but got "clang error: unsupported option --ObjC"
Thanks @claywilkinson
your check list worked for me.
Hello @claywilkinson,
If you don't mind explaining more detail, I'll be much appreciated!
I'm curious about your no. 6 checklist.
Thanks,
Most helpful comment
This could be that the postprocessing of the pbxproject file did not complete successfully. You can check the Unity console log for this.
Make sure you are: