detrend

严老师：在做Darpsf是做到detrend时报错如下：
Read 3D EPI functional images: "E:\epilepsy\Analysis\FunImgNormalizedSmoothed\sub_15"...................................
??? Error using ==> copyfile
另一个程序正在使用此文件，进程无法访问。

Error in ==> rest_Fix_Read_Write_Error at 33
copyfile([SPMPath,filesep,'@file_array',filesep,'private',filesep,Files(i).name],[RESTPath,filesep,'rest_spm5_files',filesep,'rest_',Files(i).name],'f')

Error in ==> rest_WriteNiftiImage at 91
rest_Fix_Read_Write_Error; %YAN Chao-Gan, 100426.

Error in ==> rest_writefile at 80
rest_WriteNiftiImage(data,Header,filename);

Error in ==> rest_detrend at 79
rest_writefile(single(AllVolume(:, :, :, x)), ...

Error in ==> DPARSF_run at 708
rest_detrend([AutoDataProcessParameter.DataProcessDir,filesep,FunImgDir,filesep,AutoDataProcessParameter.SubjectID{i}], '_detrend');

Error in ==> DPARSF>pushbuttonRun_Callback at 939
[Error]=DPARSF_run(handles.Cfg);

Error in ==> gui_mainfcn at 96
feval(varargin{:});

Error in ==> DPARSF at 41
gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback

请问如何解决？