i installed backuppc on ubuntu 12.0 and it was running fine upto last night but 
tosay it showing an error after giving username and passwd in web interface.

error is 
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to 
complete your request.

Please contact the server administrator, webmaster@localhost and inform them of 
the time the error occurred, and anything you might have done that may have 
caused the error.

More information about this error may be available in the server error log.
Apache/2.2.22 (Ubuntu) Server at 10.91.49.4 Port 80

apache2 service is running fine

these are the errors while starting and stopping backuppc service
root@sys:~# service backuppc stop
 * Stopping backuppc... 
No process in pidfile '/var/run/backuppc/BackupPC.pid' found running; none 
killed.                          [ OK ]

root@sys:~# service backuppc start
 * Starting backuppc...
/usr/bin/perl: symbol lookup error: /usr/lib/perl5/auto/Socket6/Socket6.so: 
undefined symbol: Perl_xs_apiversion_bootcheck


please help me . . .

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