Forced node shutdown completed. Occured during startphase 5. Caused by error 2341: 'Internal program error (2 replies)

Hi. We have a problem with one of our nodes:


In node log:
Message: System error, node killed during node restart by other node (Internal error, programming error or missing error message, please report a bug)
Error: 2303
Error data: Killed by node 2 as copyfrag failed, error: 1501
Error object: NDBCNTR (Line: 274) 0x00000002
Program: ndbd
Pid: 30112
Version: mysql-5.1.47 ndb-7.1.5
Trace: /path/to_log/ndb_2_trace.log.21
***EOM***

In NDB_MGM >
Node 2: Forced node shutdown completed. Occured during startphase 5. Caused by error 2341: 'Internal program error (failed ndbrequire)(Internal error, programming error or missing error message, please report a bug). Temporary error, restart node'.

How can we fix this ?