diff --git a/common/source/java/ch/systemsx/cisd/common/utilities/AbstractCopyActivitySensor.java b/common/source/java/ch/systemsx/cisd/common/utilities/AbstractCopyActivitySensor.java
index 448bcb34910652565eb28d5eaabf3bc6d5f92f2e..b1caa579be806ae443b6d3f99172ee8315fc97d2 100644
--- a/common/source/java/ch/systemsx/cisd/common/utilities/AbstractCopyActivitySensor.java
+++ b/common/source/java/ch/systemsx/cisd/common/utilities/AbstractCopyActivitySensor.java
@@ -127,7 +127,7 @@ public abstract class AbstractCopyActivitySensor implements IActivitySensor
         if (currentResult.isError())
         {
             return "Error: Unable to determine the time of write activity on "
-                    + getTargetDescription();
+                    + getTargetDescription() + "\n" + currentResult.tryGetErrorMessage();
         } else
         {
             final String inactivityPeriod =