Can't Execute TestSuite on SoapUI Pro

I can't execute a specific Test Suite on SoapUI. I don't know why it's happening since I have ran it multiple times.

Sample Test Suite Name: Sprint_ABC

Sample Test Case Name: Sprint_00 - ABC-0000 - abcabcabc

Here is the Error log returned

Mon Jan 22 12:33:58 CST 2018:ERROR:Exception during Test Execution
   java.lang.NullPointerException: Cannot invoke method getTestCaseByName() on null object
   	at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
   	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:48)
   	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
   	at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:35)
   	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
   	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:57)
   	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
   	at Script1.run(Script1.groovy:8)
   	at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:98)
   	at com.eviware.soapui.support.scripting.groovy.SoapUIProGroovyScriptEngineFactory$SoapUIProGroovyScriptEngine.run(SoapUIProGroovyScriptEngineFactory.java:82)
   	at com.eviware.soapui.impl.wsdl.WsdlTestSuite.runScript(WsdlTestSuite.java:622)
   	at com.eviware.soapui.impl.wsdl.WsdlTestSuite.runSetupScript(WsdlTestSuite.java:599)
   	at com.eviware.soapui.impl.wsdl.testcase.WsdlTestSuiteRunner.internalRun(WsdlTestSuiteRunner.java:113)
   	at com.eviware.soapui.impl.wsdl.testcase.WsdlTestSuiteRunner.internalRun(WsdlTestSuiteRunner.java:1)
   	at com.eviware.soapui.impl.wsdl.support.AbstractTestRunner.run(AbstractTestRunner.java:129)
   	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
   	at java.util.concurrent.FutureTask.run(Unknown Source)
   	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
   	at java.lang.Thread.run(Unknown Source)