Error in training uw3-500

[samansarraf]

I am getting the following error when using uw3-500 to train my data. The date used in the training are sequence of characters (line-level samples).
Your prompt help is appreciated !

clstmocrtrain: clstm.cc:636: void ocropus::GenericNPLSTM<F, G, H>::backward() [with int F = 1; int G = 2; int H = 2]: Assertion `!anynan(source[t])' failed.
./icrdata_IAM_cmu.sh: line 12: 8267 Aborted (core dumped) ./clstmocrtrain Train_90.txt Test_10.txt