MEG BEM failed with FIF format

[joewang]

Hello,

I'm a new user.

Following is my running environment:
window XP SP3
Matlab 7.1
BrainStorm v. 2.2.39 (04-Feb-200

It failed when I generate head model with BEM.
My MEG data format is FIF Neuromag.
I checked the Interpolative, Linear, and Collocation on the window of BEM Parameters.

Here is my situation:
================================================== ===
Warning: 'MEG Transfer Matrix data stored in file

MES\BrainStorm\run_avg__megxfer_Linear_Collocation '
exceeds MATLAB's maximum name length of 63 characters and has been truncated to
'MEG Transfer Matrix data stored in file MES\BrainStorm\run_avg_'.
> In bst_message_window at 158
In bem_xfer at 658
In bst_headmodeler>bem_GainGrid at 2314
In bst_headmodeler at 1186
In headmodeler_gui>HRunHeadModeling_Callback at 1295
In headmodeler_gui at 222
??? Undefined function or variable "GBEM_grid".

Error in ==> bst_headmodeler>bem_GainGrid at 2610
GBEM_grid = zeros(length(OPTIONS.Channel),size(GBEM_grid,2));

Error in ==> bst_headmodeler at 1186
BEMGaingridFileName = bem_GainGrid(DataType, OPTIONS, BEMChanNdx); % Computation

of the BEM gain matrix on the 3D interpolative grid for MEG and/or EEG data

Error in ==> headmodeler_gui>HRunHeadModeling_Callback at 1295
[G,OPTIONS2] = bst_headmodeler(OPTIONS.StudyFile,OPTIONS);

Error in ==> headmodeler_gui at 222
feval(varargin{:}); % FEVAL switchyard

??? Error while evaluating uicontrol Callback.
================================================== ===

My dataset path is "D:\MES". It's short enough, isn't it?
And My dataset path is "D:\BST_data\BSTDemoData\MEGData" when I run the Tutorial.
But It nerver have that problem.

Did anybody meet the same problem?