How to solve Uncaught (in promise) error in VUE?

When writing the vue project interface today, there was an Uncaught (in promise) error error.




I took a closer look, the interface is ok,




Me where the problem seems to have nothing, why the console which will be reported this wrong?


Later I found out that I did not write catch and he forcibly threw the error, so I changed the code to the following.





But after the change, it did not report the Uncaught (in promise) error error, and the other errors were reported, and a bunch of such errors were reported ↓






Reported so many mistakes, almost forced me. (But don’t panic, raise Erlang’s legs, drink a glass of water, and continue to look down)





Just write message after err.

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