I can reproduce the error. Looking in the log it has:
INFO 2015-09-19 18:21:22,291 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'long' unknown for input 'sbegin_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'long' unknown for input 'send_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'boolean' unknown for input 'sprotein_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'boolean' unknown for input 'snucleotide_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'boolean' unknown for input 'sreverse_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'boolean' unknown for input 'slower_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'boolean' unknown for input 'supper_sequence' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0 INFO 2015-09-19 18:21:22,292 (net.sf.taverna.t2.activities.soaplab.SoaplabActivity:328) - Soaplab input type 'boolean' unknown for input 'amphipathic' in http://wsembnet.vital-it.ch/soaplab2-axis/services/protein_2d_structure.pepnet, will attempt to add as String depth 0
I think those may be something to do with the error. I'll look further. Alan
