diff --git a/dgs/diagrams.py b/dgs/diagrams.py
index c141e7a..2808295 100644
--- a/dgs/diagrams.py
+++ b/dgs/diagrams.py
@@ -416,7 +416,7 @@ def getHash(txt):
         return hashId
 
     def wrap(self, txt):
-        """wraot the given text"""
+        """wrap the given text"""
         if self.id == "plantuml":
             txt = "@startuml\n%s\n@enduml\n" % txt
         return txt
diff --git a/dgs/ngwebserver.py b/dgs/ngwebserver.py
index e0b172e..0b190d0 100644
--- a/dgs/ngwebserver.py
+++ b/dgs/ngwebserver.py
@@ -177,6 +177,7 @@ def on_render(self, _e):
             genResult = gen.generate(alias, source, output_type, useCached=True)
             if not genResult.isValid():
                 msg = f"could not generate {output_type} for {gen.name} ({alias})"
+                msg += f"\n{genResult.errMsg()}"
                 raise Exception(msg)
             html = genResult.asHtml()
             self.gen_result.content = html