Added debug message

Author: SchettlerKoehler

engine/command.ts

@@ -3,6 +3,11 @@ export class Command{
     public parameterString: string;
 
     get parameters(): any[] {
-        return JSON.parse("[" + this.parameterString + "]");
+        try {
+            return JSON.parse("[" + this.parameterString + "]");
+        } catch(e) {
+            console.error("Error parsing arguments: '" + this.parameterString + "'");
+            throw e;
+        }
     }
-}
+}