EM cannot be restarted; with rocksdb exception: no such file or directory

Document ID : KB000103748
Last Modified Date : 28/06/2018
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EM cannot be started, with the following error:

[ERROR] [main] [Manager] The EM failed to start. org.rocksdb.RocksDBException: Corruption: Can't access /xyz.sst: IO error: data/metadata/xyz.sst: No such file or directory 

How to solve this issue?

reproduced on EM, Redhat 7
This is due to a corrupted metadata file.

1.) Make a backup of the folder /opt/CA/APM/data 
2.) Remove or  rename this directory. (the goal is to have no "data" directory in this path). 
3.) Restart the EM. It will create a new "data" directory.