Unable to start EM process

Document ID : KB000115377
Last Modified Date : 20/09/2018
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Introduction:
Unable to start the Introscope Enterprise Manager.
The process crashes as soon as it starts.

/etc/init.d/caEMCtrl stop: Enterprise Manager stopped
java: ./db/skiplist.h:435: void rocksdb::SkipList<Key, Comparator>::Insert(const Key&) [with Key = const char*; Comparator = const rocksdb::MemTableRep::KeyComparator&]: Assertion `prev_[0]->Next(0) == nullptr || !Equal(key, prev_[0]->Next(0)->key)' failed.
Question:
 Why does the EM fail to start and give the JVM message?
Environment:
APM 10.7
Answer:
Corrupted Smartstor Database causes the issue.

To resolve this:
- Rename <EM_Home>\ data folder;
- Afterwards, you should be able to restart the EM