diff --git a/source/OctopusTools/Importers/ProjectImporter.cs b/source/OctopusTools/Importers/ProjectImporter.cs
index c6c4e8cc0..497e8d352 100644
--- a/source/OctopusTools/Importers/ProjectImporter.cs
+++ b/source/OctopusTools/Importers/ProjectImporter.cs
@@ -115,11 +115,9 @@ protected override bool Validate(Dictionary<string, string> paramDictionary)
 
             if (validatedImportSettings.HasErrors)
             {
-                Log.Error("The following issues were found with the provided import file:");
-                foreach (var error in validatedImportSettings.ErrorList)
-                {
-                    Log.ErrorFormat(" {0}", error);
-                }
+                var errorMessagesCsvString = string.Join(Environment.NewLine, validatedImportSettings.ErrorList);
+                var errorMessage = string.Format($"The following issues were found with the provided import file: {Environment.NewLine}{errorMessagesCsvString}");
+                throw new CommandException(errorMessage);
             }
             else
             {