diff --git a/Common-Errors.md b/Common-Errors.md
index ae08579..037886a 100644
--- a/Common-Errors.md
+++ b/Common-Errors.md
@@ -22,7 +22,7 @@ If you setup the **Profit Trailer** path in "settings.general.json" and "Monitor
 
 Starting with version 2.1.0, you need to add an API token to settings.general.json to match the API token in your Profit Trailer settings.  [See 2.1.0 release notes](https://github.com/PTMagicians/PTMagic/releases/tag/2.1.0).
 
-### Unhandled Exception:  System.NullRefeerenceException
+### Unhandled Exception:  System.NullReferenceException
 
 Your settings.general.json file is likely missing a necessary setting in the "Application" section, or a comma is missing after one of your settings.  Check the release notes for any recent releases that you might have skipped since you last updated PTMagic, for any REQUIRED settings changes.