How the Corr matix is saved?

Hi experts,
I tried to use the command
R = bst_memory(‘GetConnectMatrix’, tf_plv);

The following error appeared,


** Error: Line 1613: Undefined variable “TimefreqMat” or class “TimefreqMat.RowNames”.
**
** Call stack:
** >bst_memory.m>GetConnectMatrix at 1613
** >bst_call.m at 26
** >macro_methodcall.m at 37
** >bst_memory.m at 71
**


Would you like to solve it or tell us how to read the tfmat in other ways?
The version of brainstorm is 7 Jun, 2016.
Thank you very much.

Best wishes,
Junpeng