Failed to Start OPManager

Pls help me to solve it when trying to start OPManager.

[root@DC2CACTI bin]# sh StartOpManagerServer.sh
inside addon check
SQLException while getting database connection. Check if database daemon is running
java.sql.SQLException: General error, message from server: "Unknown database 'OpManagerDB'"
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1822)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1749)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:830)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1731)
at com.mysql.jdbc.Connection.<init>(Connection.java:559)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:358)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at jdbc.CreateSchema.instantiateConnection(CreateSchema.java:146)
at jdbc.CreateSchema.init(CreateSchema.java:84)
at com.adventnet.nms.startnms.NmsMainBE.main(NmsMainBE.java:343)
at com.adventnet.me.opmanager.server.OpManagerMainBE.main(OpManagerMainBE.java:80)
Exiting OpManager