diff --git a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.dtd b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.dtd
index 8901e5ae23d..beb1ba31d25 100644
--- a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.dtd
+++ b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.dtd
@@ -519,6 +519,13 @@
 <!ENTITY calendar.print.onlyitemsstatus.label "Print only items with this status:">
 <!ENTITY calendar.print.onlyitemscategory.label "Print only items with this category:">
 
+<!-- Error reporting -->
+<!ENTITY calendar.error.detail "Details...">
+<!ENTITY calendar.error.number "Error number:">
+<!ENTITY calendar.error.description "Description:">
+<!ENTITY calendar.error.title "An error has occurred">
+
+
 <!-- LOCALIZATION NOTE (mainWindow.title): DONT_TRANSLATE -->
 <!ENTITY mainWindow.title "&brandFullName;">
 <!-- LOCALIZATION NOTE (mainWindow.titlemodifier) : DONT_TRANSLATE -->
diff --git a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
index 35b121a870d..e970c226dcc 100644
--- a/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
+++ b/mozilla/calendar/locales/en-US/chrome/calendar/calendar.properties
@@ -205,6 +205,8 @@ httpPutError=Publishing the calendar file failed.\nStatus code: %1$S: %2$S
 otherPutError=Publishing the calendar file failed.\nStatus code: 0x%1$S
 contentError=This doesn't appear to be a valid file. Here's what I got back from\n%1$S:\nResult: %2$S
 readOnlyMode=There has been an error reading data for calendar: %1$S. It has been placed in read-only mode, since changes to this calendar will likely result in data-loss.  You may change this setting by choosing 'Edit Calendar'.
+minorError=There has been an error reading data for calendar: %1$S.  However, this error is believed to be minor, so the program will attempt to continue.
+stillReadOnlyError=There has been an error reading data for calendar: %1$S.
 
 # Translators, please put the most likely timezone that the people using your
 # locale will be in.  This needs to be a long name taken from