For the first problem, i.e., "0 : ML_CommInfoOP_GenUsingGIDExternals warning : index out of bound", it may be caused by something wrong in your input file. In particular, the index of atoms to align the electrodes and the center region are not specified properly. If possible, please show your input file to us.
The possible reason for the second problem (i.e., "Segmentation fault of VNL"): some of libraries required for VNL are not installed properly into your system.