Assignment has more non-singleton rhs dimensions than non-singleton subscripts

i am trying to use the FrangiFilter2D function on images extracted from coronary angiography video, but when i use the function is give this error " Assignment has more non-singleton rhs dimensions than non-singleton subscripts .
Error in ==> FrangiFilter2D at 96
    ALLfiltered(:,:,i) = Ifiltered; "
the code is like this:
I=double(imread('vessel.jpg'));
Ivessel=FrangiFilter2D(I);