Liquibase lock – reasons?

I get this when running a lot of liquibase-scripts against a Oracle-server. SomeComputer is me.

Waiting for changelog lock....
Waiting for changelog lock....
Waiting for changelog lock....
Waiting for changelog lock....
Waiting for changelog lock....
Waiting for changelog lock....
Waiting for changelog lock....
Liquibase Update Failed: Could not acquire change log lock.  Currently locked by SomeComputer (192.168.15.X) since 2013-03-20 13:39
SEVERE 2013-03-20 16:59:liquibase: Could not acquire change log lock.  Currently locked by SomeComputer (192.168.15.X) since 2013-03-20 13:39
liquibase.exception.LockException: Could not acquire change log lock.  Currently locked by SomeComputer (192.168.15.X) since 2013-03-20 13:39
        at liquibase.lockservice.LockService.waitForLock(LockService.java:81)
        at liquibase.Liquibase.tag(Liquibase.java:507)
        at liquibase.integration.commandline.Main.doMigration(Main.java:643)
        at liquibase.integration.commandline.Main.main(Main.java:116)

Could it be that the number of simultaneous sessions/transactions are reached? Anyone has any ideas?

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