Index: lams_common/src/java/org/lamsfoundation/lams/learningdesign/dto/LearningDesignDTO.java
===================================================================
diff -u -r1ab5b0aabad85e5cee0203bd43e0da1c83f69fb9 -re0d0186bf70f101ba4e77e383575300eac9b70e1
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/dto/LearningDesignDTO.java	(.../LearningDesignDTO.java)	(revision 1ab5b0aabad85e5cee0203bd43e0da1c83f69fb9)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/dto/LearningDesignDTO.java	(.../LearningDesignDTO.java)	(revision e0d0186bf70f101ba4e77e383575300eac9b70e1)
@@ -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 -r94051ca48eaeea022c93e550ff9c498b513919e4 -re0d0186bf70f101ba4e77e383575300eac9b70e1
--- lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java	(.../ExportToolContentService.java)	(revision 94051ca48eaeea022c93e550ff9c498b513919e4)
+++ lams_common/src/java/org/lamsfoundation/lams/learningdesign/service/ExportToolContentService.java	(.../ExportToolContentService.java)	(revision e0d0186bf70f101ba4e77e383575300eac9b70e1)
@@ -1312,8 +1312,8 @@
 		badFileType(ldErrorMsgs, filename, "Unexpected extension");
 	    }
 
-	} catch (Exception e) {
-	    throw new ImportToolContentException(e);
+	}  catch (Exception e) {
+	    throw new ImportToolContentException("Error while importing a sequence", e);
 	}
 
 	ldResults[0] = ldId;