matin mortazavi / I debugged the code. The issue was that it couldn’t recognize the file paths

src/org/behavior/Serviceable.java

@@ -0,0 +1,10 @@
+package org.behavior;
+
+import org.model.Vehicle;
+
+public interface Serviceable {
+
+    void performService();
+
+    boolean needsService(Vehicle v);
+}