You must follow the instructions in FAQ 5 and in the Following -current FAQ.
ALWAYS start with the most recent SNAPSHOT. You failed to do this. Source upgrades to -current from any other binary version are not supported.
Please note, -current is already months beyond 4.8. If you upgrade from 4.7 to a snapshot, rather than installing a fresh snapshot, you will have to follow all of the architectural changes in the Following -current FAQ very, very carefully.
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