Unwarp terminated abnormally (Matlab 2017b/SPM12/conn 18.a)

Dear Experts

I got these errors while performing functional realignment and unwarp. 

Thanks for considering my request.


Best regards
Larry

------------------------------------------------------------------------
Running job #1
------------------------------------------------------------------------
Running 'Realign & Unwarp'

SPM12: spm_realign (v7141) 23:07:00 - 07/04/2018
========================================================================
Completed : 23:07:18 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:07:18 - 07/04/2018
========================================================================
Completed : 23:09:24 - 07/04/2018
SPM12: spm_uw_apply (v6301) 23:09:24 - 07/04/2018
========================================================================
Computing mask... : ...done
Reslicing images... : ...done
Writing mean image... : ...done
Completed : 23:10:11 - 07/04/2018
Done 'Realign & Unwarp'
Running 'Realign & Unwarp'
SPM12: spm_realign (v7141) 23:10:11 - 07/04/2018
========================================================================
Completed : 23:10:30 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:10:30 - 07/04/2018
========================================================================
Completed : 23:13:44 - 07/04/2018
SPM12: spm_uw_apply (v6301) 23:13:44 - 07/04/2018
========================================================================
Computing mask... : ...done
Reslicing images... : ...done
Writing mean image... : ...done
Completed : 23:14:31 - 07/04/2018
Done 'Realign & Unwarp'
Running 'Realign & Unwarp'
SPM12: spm_realign (v7141) 23:14:31 - 07/04/2018
========================================================================
Completed : 23:14:50 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:14:50 - 07/04/2018
========================================================================
[color=#ff0000]Unwarp terminated abnormally.[/color]
[color=#ff0000]Failed 'Realign & Unwarp'[/color]
[color=#ff0000]Error using spm_bsplinc[/color]
[color=#ff0000]Cant open image file.[/color]
[color=#ff0000]In file "C:\spm12\spm_uw_estimate.m" (v6824), function "make_ref" at line 712.[/color]
[color=#ff0000]In file "C:\spm12\spm_uw_estimate.m" (v6824), function "spm_uw_estimate" at line 352.[/color]
[color=#ff0000]In file "C:\spm12\config\spm_run_realignunwarp.m" (v6554), function "spm_run_realignunwarp" at line 90.[/color]
Running 'Realign & Unwarp'
SPM12: spm_realign (v7141) 23:17:07 - 07/04/2018
========================================================================
Completed : 23:17:27 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:17:27 - 07/04/2018
========================================================================
Completed : 23:20:50 - 07/04/2018
SPM12: spm_uw_apply (v6301) 23:20:51 - 07/04/2018
========================================================================
Computing mask... : ...done
Reslicing images... : ...done
Writing mean image... : ...done
Completed : 23:21:38 - 07/04/2018
Done 'Realign & Unwarp'
Running 'Realign & Unwarp'
SPM12: spm_realign (v7141) 23:21:38 - 07/04/2018
========================================================================
Completed : 23:21:58 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:21:58 - 07/04/2018
========================================================================
Completed : 23:24:06 - 07/04/2018
SPM12: spm_uw_apply (v6301) 23:24:07 - 07/04/2018
========================================================================
Computing mask... : ...done
Reslicing images... : ...done
Writing mean image... : ...done
Completed : 23:24:54 - 07/04/2018
Done 'Realign & Unwarp'
Running 'Realign & Unwarp'
SPM12: spm_realign (v7141) 23:24:54 - 07/04/2018
========================================================================
Completed : 23:25:13 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:25:13 - 07/04/2018
========================================================================
Completed : 23:27:18 - 07/04/2018
SPM12: spm_uw_apply (v6301) 23:27:18 - 07/04/2018
========================================================================
Computing mask... : ...done
Reslicing images... : ...done
Writing mean image... : ...done
Completed : 23:28:05 - 07/04/2018
Done 'Realign & Unwarp'
Running 'Realign & Unwarp'
SPM12: spm_realign (v7141) 23:28:05 - 07/04/2018
========================================================================
Completed : 23:28:24 - 07/04/2018
SPM12: spm_uw_estimate (v6824) 23:28:24 - 07/04/2018
========================================================================