unclear error message

Hello,
I repeatedly encounter this error (please find error message included below) although when loading the project no missing files are detected.
Can someone help how to handle this.
Thanx

ERROR DESCRIPTION:

Error using spm_sample_vol
Cant open image file.
Error in spm_get_data (line 46)
Y(i,:) = spm_sample_vol(V(i),XYZ(1,:),XYZ(2,:),XYZ(3,:),0);
Error in conn_create_vol (line 115)
x(nscan,:)=spm_get_data(V1(nscan),pinv(V1(nscan).mat)*xyzs(idx0,:)');
Error in conn_process (line 575)
V=conn_create_vol(filename,Vsource,[],Vref,sfile,Vmask,CONN_x.Setup.analysisunits==1,CONN_x.Setup.spatialresolution==4,0); %CONN_x.Setup.surfacesmoothing);
Error in conn_process (line 16)
case 'setup', conn_disp(['CONN: RUNNING SETUP STEP']); conn_process([0:4,4.5,5]);
Error in conn (line 5262)
else conn_process(processname); ispending=false;
Error in conn_menumanager (line 120)
feval(CONN_MM.MENU{n0}.callback{n1}{1},CONN_MM.MENU{n0}.callback{n1}{2:end});
CONN18.b
SPM12 + DEM FieldMap MEEGtools
Matlab v.2018b
project: CONN18.b
storage: 7209.9Gb available
spm @ /usr/local/MATLAB/toolbox/spm12
conn @ /scratch/igis/processing/conn