java.lang.NullPointerException: Cannot get property 'info' on null object: Swagger YAML import error

I am facing issues while importing my swagger YAML file to SoapUI, see SoapUI error logs below:

Tried exploring other similar threads but couldn't figure out the issue, any inputs would be really helpful. Thanks.

java.lang.NullPointerException: Cannot get property 'info' on null object
at org.codehaus.groovy.runtime.NullObject.getProperty(NullObject.java:60)
at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:172)
at org.codehaus.groovy.runtime.callsite.NullCallSite.getProperty(NullCallSite.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:296)
at com.smartbear.swagger.Swagger2Importer.createRestService(Swagger2Importer.groovy:220)
at com.smartbear.swagger.Swagger2Importer.this$2$createRestService(Swagger2Importer.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
at com.smartbear.swagger.Swagger2Importer.importSwagger(Swagger2Importer.groovy:72)
at com.smartbear.swagger.SwaggerImporter$importSwagger.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at com.smartbear.swagger.SwaggerUtils$1.construct(SwaggerUtils.groovy:75)
at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:46)
at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:131)
at java.lang.Thread.run(Unknown Source)
Mon Nov 11 16:49:32 IST 2019:ERROR:java.lang.NullPointerException: Cannot get property 'info' on null object
java.lang.NullPointerException: Cannot get property 'info' on null object
at org.codehaus.groovy.runtime.NullObject.getProperty(NullObject.java:60)
at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:172)
at org.codehaus.groovy.runtime.callsite.NullCallSite.getProperty(NullCallSite.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:296)
at com.smartbear.swagger.Swagger2Importer.createRestService(Swagger2Importer.groovy:220)
at com.smartbear.swagger.Swagger2Importer.this$2$createRestService(Swagger2Importer.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
at com.smartbear.swagger.Swagger2Importer.importSwagger(Swagger2Importer.groovy:72)
at com.smartbear.swagger.SwaggerImporter$importSwagger.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at com.smartbear.swagger.SwaggerUtils$1.construct(SwaggerUtils.groovy:75)
at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:46)
at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:131)
at java.lang.Thread.run(Unknown Source)