hi

i an on liferay 6.2, i want upgrade to 7.x for many years.
and now i think it's time to do it.

my plan is
back up the db, upgrade db via liferay dev studio. and re-write all apps. yes, one by one.
because i try liferay upgrade plan, it not work very well.

but i still get problem. i download 7.3 ga6 boundle with tomcat, and create an portal-setup-wizard.properties 
setup.wizard.enabled=true
and triggered it to run by eclipse.
after i upgarde database, no exception, run so well.
but when i try login, it fail because liferay cannot find user.
I originally thought that even if there is no app, I still point to the upgraded db. At least I should be able to log in. Is there anything wrong with me?

error message:

2021-01-14 07:09:55.822 ERROR [http-nio-8080-exec-6][ImageImpl:69] Error reading image 34502
com.liferay.document.library.kernel.exception.NoSuchFileException: {companyId=0, repositoryId=0, fileName=34502.png, cause=java.io.FileNotFoundException: C:\liferay-ce-portal-7.3.5-ga6\data\document_library\0\0\34502.png\1.0 (蝟餌絞?銝????楝敺??)}
    at com.liferay.portal.store.file.system.FileSystemStore.getFileAsStream(FileSystemStore.java:140)

thank you.