diff --git a/lib/preprocessor.js b/lib/preprocessor.js
index e64826d7b..40430ddfa 100644
--- a/lib/preprocessor.js
+++ b/lib/preprocessor.js
@@ -26,12 +26,17 @@ var createPreprocessor = function(config, basePath, injector) {
 
       preprocessors.shift()(content, file, nextPreprocessor);
     };
-    var instantiatePreprocessor = function(preprocessorName) {
+    var instantiatePreprocessor = function(name) {
       try {
-        preprocessors.push(injector.get('preprocessor:' + preprocessorName));
+        preprocessors.push(injector.get('preprocessor:' + name));
       } catch (e) {
         // TODO(vojta): log warning only once per each preprocessor
-        log.warn('Pre-processor "%s" is not registered!', preprocessorName);
+        if (e.message.indexOf('No provider for "preprocessor:' + name + '"') !== -1) {
+          log.warn('Can not load "%s", it is not registered!\n  ' +
+                   'Perhaps you are missing some plugin?', name);
+        } else {
+          log.warn('Can not load "%s"!\n  ' + e.stack, name);
+        }
       }
     };