nfsmnthelp: 1831-019 nim_master: System call error number -1.

Problem:
nim_master:root:#nim -o define -t mksysb -a server=master -a location=/export01/mksysb/mk_client  -a mk_image=yes -a source=tmsp>

0042-001 nim: processing error encountered on "master":
0042-001 m_mkbosi: processing error encountered on "client_name":
   warning: 0042-175 c_mkbosi: An unexpected result was returned by the "/usr/sbin/mount" command:

nfsmnthelp: 1831-019 nim_master: System call error number -1.

mount: 1831-008 giving up on:
nim_master:/export/mksysb
System call error number -1.

rc=175
0042-175 c_mkbosi: An unexpected result was returned by the "/usr/sbin/mount" command:
nfsmnthelp: 1831-019 nim_master: System call error number -1.

mount: 1831-008 giving up on: nim_master:/export01/mksysb  System call error number -1.

Solution : ??