Thank a lot. I find this in manual.

Note: A NetWorker 7.5.x Console server configured to use LDAP for 
authentication can
cause the NMC to fail to start after the update to NetWorker 7.6. If this 
occurs, this message
is written to the gstd.raw file in the Console logs directory:
"acm: External directory library initialization failed".

If the NMC fails to start after the update to NetWorker 7.6, reset the Console
authentication configuration and reconfigure LDAP by performing the following
steps:
a. Stop all gstd services.
b. Go to NMC install directory/cst.
c. Delete the files Config.xml, csp.clb, csp.clb.bak and upgrade_csp.tag, if
present.
d. Copy Config.xml.template to Config.xml.
e. Start the Console.
The Console starts in native authentication mode.
f. Log into the Console as administrator with the password last set for
administrator before switching to LDAP mode.
g. In Setup > Configure Login Authentication, configure LDAP again

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