multiple regression

 你好,我在做抑郁患者和汉密尔顿抑郁量表得分的相关,用的是spm里的multiple regression,当我把抑郁者每个人的图像输进去,再把抑郁得分作为covariates输进去后,发现总是出现以下错误,导致无法建立矩阵,请问这是什么原因啊?

Running "Factorial design specification"
Mapping files                           : Error running job:
Error using ==> class
Cannot change the number of fields of class 'file_array' without first typing 'clear classes'.
D:\Program Files\MATLAB\R2009a\toolbox\spm5\@file_array\file_array.m at line 39
D:\Program Files\MATLAB\R2009a\toolbox\spm5\@nifti\nifti.m at line 70
D:\Program Files\MATLAB\R2009a\toolbox\spm5\spm_vol_nifti.m at line 16
D:\Program Files\MATLAB\R2009a\toolbox\spm5\spm_vol.m at line 122
D:\Program Files\MATLAB\R2009a\toolbox\spm5\spm_vol.m at line 83
D:\Program Files\MATLAB\R2009a\toolbox\spm5\spm_vol.m at line 71
D:\Program Files\MATLAB\R2009a\toolbox\spm5\spm_vol.m at line 57
D:\Program Files\MATLAB\R2009a\toolbox\spm5\spm_config_factorial_design.m at line 1361
D:\Program Files\MATLAB\R2009a\toolbox\spm5\toolbox\vbm5\spm_jobman.m at line 1557
D:\Program Files\MATLAB\R2009a\toolbox\spm5\toolbox\vbm5\spm_jobman.m at line 1567
D:\Program Files\MATLAB\R2009a\toolbox\spm5\toolbox\vbm5\spm_jobman.m at line 1567
D:\Program Files\MATLAB\R2009a\toolbox\spm5\toolbox\vbm5\spm_jobman.m at line 1504
--------------------------
Done.
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