diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Element.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Element.java
index 13d54742f..b55dde38e 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Element.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/model/Element.java
@@ -426,9 +426,9 @@ public abstract class Element extends Base implements IBaseHasExtensions, IBaseE
     if (ext.isEmpty()) 
       return null; 
     if (ext.size() > 1) 
-      throw new FHIRException("Multiple matching extensions found");
+      throw new FHIRException("Multiple matching extensions found for extension '"+theUrl+"'");
     if (!ext.get(0).getValue().isPrimitive())
-      throw new FHIRException("Extension could not be converted to a string");
+      throw new FHIRException("Extension '"+theUrl+"' could not be converted to a string");
     return ext.get(0).getValue().primitiveValue();
   }