Yup, exactly what @Arkshine said. We’ll be releasing beta4 in the next week or two. So if you want to stick with the ‘beta’ release path you’ll need to wait until that happens. Alternatively, you could switch to the default ‘tests-passed’ release path, which is what the vast majority of people use (including our official paid hosting).
Did you revert the database from a backup? If not, and you’re running 3.1 against a 3.2.0.beta3 database schema, you may run into some other strange failures.