OK,thanks!
I found the problem; The custom defined module is not upgraded to 4.4.0。
There is too little exception information :)
run *.DbMigrator:
System.NullReferenceException HResult=0x80004003 Message=Object reference not set to an instance of an object. Source=Volo.Abp.Core StackTrace: at Volo.Abp.AbpApplicationWithInternalServiceProvider.Dispose()
My code is canceled, stack no message. stack = null.
I misread it. That's it。 thank you liangshiwei laotie!!!
Results still the same, login button cannot be clicked;