Issue with ART-based scrubbing procedure

Dear Alfonso (or anyone else who may be able to help!),

I am trying to apply the ART-based scrubbing procedure to my mostly preprocessed (external to CONN) dataset. I have tried both saving my 6-parameter motion estimates as a text file in the same directory as the functional data ( where the text file is named rp_functionalname.txt) AND loading them as a first-level covariate named "realignment", however, I keep getting the following error: 

ERROR DESCRIPTION:

Error using cellstr (line 34)
Input must be a string.
Error in conn_setup_preproc (line 798)
temp=cellstr(CONN_x.Setup.functional{nsubject}{nses}{1});
Error in conn (line 776)
ok=conn_setup_preproc('',varargin{2:end});
Error in conn_menumanager (line 119)
feval(CONN_MM.MENU{n0}.callback{n1}{1},CONN_MM.MENU{n0}.callback{n1}{2:end});
CONN v.16.b
SPM12 + DEM FieldMap MEEGtools
Matlab v.2012b
storage: 2558.3Gb available

I am not sure what the issue is. I have attached an example motion parameter file to this post, in case this may be of use. Any help would be greatly appreciated!

Buddhika