Dear Mauro,

Your data is obviously strange.

From bvals, there are five zero, which indicate there exist 5 b0 with no diffusion weighting.
However, from bvecs file, there is no b0, because the direction of b0 should be [0 0 0].

According to bvals file, your bvecs file should be

0            0            0           0           0         9.999662e-01 1.644269e-01 -1.040065e-01 9.005661e-01 -1.619463e-01 -8.120095e-01 6.611239e-01 5.830750e-01 9.033998e-01 6.953399e-01 3.550852e-01 5.355993e-01 -5.200163e-01 -6.362019e-01 -3.377672e-01 -5.220049e-01 6.026920e-01 2.121724e-01 -8.344338e-03 -5.150832e-01 4.178560e-01 -6.839702e-01 8.856035e-01 2.681560e-01 8.124579e-02 2.969511e-01 8.829391e-01 2.633199e-01 8.259287e-02 8.631831e-01
0            0            0           0           0         1.955039e-03 9.824392e-01 5.943962e-01 -4.062233e-01 -6.705973e-01 -4.223911e-01 3.057329e-01 7.844719e-01 2.252240e-01 -7.107556e-01 -9.066789e-01 -4.217951e-01 -4.621962e-01 6.544571e-01 7.682163e-02 -8.115827e-01 5.682777e-03 -1.436159e-01 -8.669199e-01 6.768992e-01 6.836659e-01 2.031285e-01 -3.288531e-01 3.527024e-01 2.735445e-01 -9.305955e-01 -4.592975e-02 -5.190339e-01 9.080390e-01 5.046622e-01
0            0            0           0           0         7.962143e-03 -8.818653e-02 -7.974184e-01 1.548013e-01 -7.239291e-01 -4.027743e-01 -6.851585e-01 -2.112505e-01 -3.648880e-01 -1.064354e-01 2.277018e-01 7.315888e-01 -7.183023e-01 -4.085741e-01 9.380890e-01 -2.623796e-01 7.979535e-01 9.666215e-01 4.983780e-01 5.258288e-01 -5.983280e-01 7.006593e-01 -3.279660e-01 -8.964892e-01 9.584222e-01 -2.140357e-01 4.672364e-01 -8.131830e-01 4.106619e-01 -1.522253e-02