Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/dto/LearningDesignDTO.java
===================================================================
diff -u -r3c92e96dc7aea4200c6fd6c6b0b1a9e2ccfb2961 -r9cbdee7e760314789856424c9b4e8e4e4fb70db7
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/dto/LearningDesignDTO.java	(.../LearningDesignDTO.java)	(revision 3c92e96dc7aea4200c6fd6c6b0b1a9e2ccfb2961)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/dto/LearningDesignDTO.java	(.../LearningDesignDTO.java)	(revision 9cbdee7e760314789856424c9b4e8e4e4fb70db7)
@@ -696,7 +696,7 @@
      *                The firstActivityUIID to set.
      */
     public void setFirstActivityUIID(Integer firstActivityUIID) {
-	if (!firstActivityUIID.equals(WDDXTAGS.NUMERIC_NULL_VALUE_INTEGER))
+	if (firstActivityUIID != null && !firstActivityUIID.equals(WDDXTAGS.NUMERIC_NULL_VALUE_INTEGER))
 	    this.firstActivityUIID = firstActivityUIID;
     }
 
Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java
===================================================================
diff -u -rd8b29057afb2c022ef5354ba599da67f51d61abb -r9cbdee7e760314789856424c9b4e8e4e4fb70db7
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java	(.../ExportToolContentService.java)	(revision d8b29057afb2c022ef5354ba599da67f51d61abb)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java	(.../ExportToolContentService.java)	(revision 9cbdee7e760314789856424c9b4e8e4e4fb70db7)
@@ -1302,7 +1302,7 @@
 	    }
 
 	} catch (Exception e) {
-	    throw new ImportToolContentException(e);
+	    throw new ImportToolContentException("Error while importing a sequence", e);
 	}
 
 	ldResults[0] = ldId;