diff --git a/src/org/testKitGen/Arguments.java b/src/org/testKitGen/Arguments.java
index 5f46f4bc..5d9dfe56 100644
--- a/src/org/testKitGen/Arguments.java
+++ b/src/org/testKitGen/Arguments.java
@@ -151,7 +151,13 @@ private String spec2Plat(String spec) {
 			Properties platProp = new Properties();
 			platProp.load(platReader);
 			plat = platProp.getProperty(spec);
+			if (plat == null) {
+				System.err.println("Error: Please update file " + Constants.BUILDPLAT_JSON + "! Add entry for " + spec + ".");
+				System.exit(1);
+			}
 		} catch (IOException e) {
+			e.printStackTrace();
+			System.exit(1);
 		}
 		return plat;
 	}