I create constraint in Neo4j Shell(2.0.1) with this syntax => CREATE 
CONSTRAINT ON(U:User) ASSERT U.user_id is UNIQUE;
And can see the schema with this syntax => schema ls -l :User

but when I want to drop contraint with this syntax => DROP CONSTRAINT 
ON(U:User) ASSERT U.user_id is UNIQUE;
it returns error result => SystemException: TM has encountered some 
problem, please perform necessary action (tx recovery/restart)
And when I want to see the scema with this syntax => schema ls -l :User
it returns error result too => SystemException: TM has encountered some 
problem, please perform necessary action (tx recovery/restart)

And when I restart my neo4j, and see the schema, suddenly there is no 
indexes and constraints that I already created before.

so, What happened to my neo4j actually? and how to solve this problem? and 
how to drop constraint with this syntax => DROP CONSTRAINT ON(U:User) 
ASSERT U.user_id is UNIQUE;?

Thank you.

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