ERROR ChEMBLdb Connector Input 5:51

I am getting ERROR ChEMBLdb Connector Input 5:51. I am using Knime 3.5 on windows 8, 64 bit desktop.

Hi Shamim,
Which version of the KNIME Analytics Platform 3.5 are you using? 3.5.0 or 3.5.1 or 3.5.2?
I haven’t been able yet to reproduce the error you are getting. Could you please share the error messages you are getting from knime.log file? It is accessible via View > Open KNIME log
In general, these nodes are contributed by EMBL-EBI and they would be the best contact here.

Hope it helps,