IOS Example cant running

[xiaoyan159]

Hi：
I'm trying to run VTM-IOS-Sample，but the main class cant find GDXMap，and when run the simple App just take a null exception。If I could change some config file to fix it？
By the way，I just clone the repository and dont change build.gradle by this instruction, so If I must modify the build.gradle config file？

[xiaoyan159]

the Error Log：
[ERROR] Couldn't start application
java.lang.NullPointerException
at org.robovm.idea.running.RoboVmRunProfileState.executeRun(RoboVmRunProfileState.java:57)
at org.robovm.idea.running.RoboVmRunProfileState.startProcess(RoboVmRunProfileState.java:126)
at com.intellij.execution.configurations.CommandLineState.execute(CommandLineState.java:61)
at org.robovm.idea.running.RoboVmRunner.doExecute(RoboVmRunner.java:79)
at com.intellij.execution.runners.GenericProgramRunner$execute$$inlined$runProfileStarter$1.executeAsync(GenericProgramRunner.kt:56)
at com.intellij.execution.runners.GenericProgramRunnerKt$startRunProfile$$inlined$runProfileStarter$1.executeAsync(GenericProgramRunner.kt:56)
at com.intellij.execution.impl.ExecutionManagerKtImpl$startRunProfile$startRunnable$1.run(ExecutionManagerKtImpl.kt:66)
at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:83)
at com.intellij.openapi.application.TransactionGuardImpl.lambda$pollQueueLater$0(TransactionGuardImpl.java:68)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:441)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:424)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:407)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:908)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:781)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:424)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:698)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:423)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)