ConfigurationManager may not be able to find the appropriate file, so fall back to opening a configuration manually. This is happening under Linux/Mono for instance.

Author: obones

project/core/publishers/BuildLogTransformer.cs

@@ -22,6 +22,9 @@ public class BuildLogTransformer
 		public string TransformResultsWithAllStyleSheets(XPathDocument document)
 		{
 			var section = ConfigurationManager.GetSection("xslFiles") as XslFilesSectionHandler;
+            if (section == null)
+                section = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None).GetSection("xslFiles") as XslFilesSectionHandler;
+            
 			return TransformResults(section?.FileNames, document);
 		}