I was breaking my head why I couldn't resolve this error in Laravel, finally found the solution here with this guy. Very good tutorial by the way if you are starting wtih VueJs in Laravel.
In this video, he shows exactly what the solution is and how to fix it. Maybe your error not the exactly the same but hopefully it will give you a clue on how to resolve your error also.
I struggle to find a solution and spent days trying to figure it out until I my friend told me about this guy and may this video could help, and it sure did because after watching for like 15 seconds, i knew exactly how to fix my code.
After fixing my code, it works great.