CCL: NBO + l607.exe error

From: "Mo Fateh" <mo.fateh++yahoo.com>
Subject: CCL: NBO + l607.exe error
Date: Thu, 4 Jul 2019 17:07:15 -0400

 Sent to CCL by: "Mo  Fateh" [mo.fateh() yahoo.com]
 Dear CCL users
 I got the following error during NBO calculations of some organic
 molecules.
 <<Input file>>
 # pm7  nosymm geom=allcheck pop=nbo guess=read IOp(3/59=5)
 ----------------------------------------------------------
 <<The error>>
 Unable to label the NBOs properly: 149 unstarred orbitals
                                      77 occupied orbitals
  Error
  Error termination via Lnk1e in C:\G16W\l607.exe at Thu Jul 04 23:17:13
 2019.
  Job cpu time:       0 days  0 hours  0 minutes  7.0 seconds.
  Elapsed time:       0 days  0 hours  0 minutes  6.1 seconds.
  File lengths (MBytes):  RWF=     20 Int=      0 D2E=      0 Chk=     94
 Scr=      1
 ----------------------------------------------------------
 Can anybody solve this problem?
 With thanks.
 Mo