diff --git a/lib/opencv.js b/lib/opencv.js
index 283dc8a..8007e61 100755
--- a/lib/opencv.js
+++ b/lib/opencv.js
@@ -74,7 +74,7 @@ var getBufferMethodName = function(bytes, dataType, endianness, read){
   } else if(bytes === 16){
     fnName += (dataType === "U" ? "U" : "")+"Int16"+endianness;
   } else {
-    throw("This matrix type ("+type+") is not compatible with fromArray, you can implement if you need it")
+    throw("This matrix type ( CV_"+bytes+dataType+") is not compatible with fromArray, you can implement if you need it")
   }
   return fnName;
 };