Why is my training rusult (log loss) is always 0

Creating validation dataset of 0.01 of training for adaptive regularization
-- Epoch 1
Training MSE: nan
-- Epoch 2
Training MSE: nan
-- Epoch 3
Training MSE: nan
-- Epoch 4
Training MSE: nan
-- Epoch 5
Training MSE: nan
-- Epoch 6
Training MSE: nan
-- Epoch 7
Training MSE: nan
-- Epoch 8
Training MSE: nan
-- Epoch 9
Training MSE: nan
-- Epoch 10
Training MSE: nan