Yes, It's working now.Thank you.
I used "abp suite" to create a solution. When “Separated Identity Server” option was checked, I got an exception when log in. If I didn’t check the option, everyting is ok. Then I got the solution as following:
I compiled the solution successfully. After database migration, I started IdentityServer successfully. I started HttpApiHost successfully. At last I typed “yarn start” to start UI successfully.