catch exception when unable to run the topology main and print an error
catch exception when unable to run the topology main and print an error

lukess/heron,srkukarni/heron,ashvina/heron,cliffyg/heron,ashvina/heron,tomncooper/heron,moomou/heron,streamlio/heron,lukess/heron,cs564/heron,objmagic/heron,lewiskan/heron,ashvina/heron,billonahill/heron,zhangzhonglai/heron,lewiskan/heron,cliffyg/heron,lukess/heron,huijunwu/heron,zhangzhonglai/heron,billonahill/heron,huijunwu/heron,tomncooper/heron,objmagic/heron,wangli1426/heron,twitter/heron,streamlio/heron,zhangzhonglai/heron,wangli1426/heron,huijunwu/heron,lewiskan/heron,moomou/heron,moomou/heron,streamlio/heron,wangli1426/heron,ashvina/heron,cliffyg/heron,lucperkins/heron,lucperkins/heron,lucperkins/heron,objmagic/heron,lukess/heron,nlu90/heron,ashvina/heron,mycFelix/heron,lewiskan/heron,cliffyg/heron,lucperkins/heron,tomncooper/heron,streamlio/heron,cs564/heron,lucperkins/heron,cs564/heron,cs564/heron,moomou/heron,mycFelix/heron,wangli1426/heron,billonahill/heron,lewiskan/heron,twitter/heron,cliffyg/heron,twitter/heron,zhangzhonglai/heron,ashvina/heron,tomncooper/heron,tomncooper/heron,moomou/heron,moomou/heron,objmagic/heron,ashvina/heron,billonahill/heron,twitter/heron,lucperkins/heron,streamlio/heron,zhangzhonglai/heron,lucperkins/heron,streamlio/heron,lukess/heron,nlu90/heron,tomncooper/heron,billonahill/heron,mycFelix/heron,lucperkins/heron,nlu90/heron,cs564/heron,objmagic/heron,cs564/heron,mycFelix/heron,cliffyg/heron,zhangzhonglai/heron,streamlio/heron,lewiskan/heron,wangli1426/heron,billonahill/heron,srkukarni/heron,ashvina/heron,huijunwu/heron,tomncooper/heron,zhangzhonglai/heron,cs564/heron,moomou/heron,billonahill/heron,wangli1426/heron,objmagic/heron,lewiskan/heron,lukess/heron,cliffyg/heron,cs564/heron,lewiskan/heron,srkukarni/heron,objmagic/heron,nlu90/heron,mycFelix/heron,lukess/heron,huijunwu/heron,zhangzhonglai/heron,cs564/heron,ashvina/heron,huijunwu/heron,twitter/heron,moomou/heron,objmagic/heron,twitter/heron,srkukarni/heron,tomncooper/heron,nlu90/heron,huijunwu/heron,cliffyg/heron,streamlio/heron,huijunwu/heron,wangli1426/heron,srkukarni/heron,wangli1426/heron,srkukarni/heron,zhangzhonglai/heron,twitter/heron,tomncooper/heron,billonahill/heron,cliffyg/heron,streamlio/heron,nlu90/heron,lukess/heron,mycFelix/heron,mycFelix/heron,nlu90/heron,lewiskan/heron,nlu90/heron,twitter/heron,wangli1426/heron,moomou/heron,billonahill/heron,nlu90/heron,objmagic/heron,srkukarni/heron,lukess/heron,mycFelix/heron,mycFelix/heron,srkukarni/heron