Where did you get it from? It looks like you downloaded the wrong add-on.
5.1b1 is available from here: https://developer.mozilla.org/en-US/docs/Mozilla/Calendar/Calendar_Versions https://addons.mozilla.org/en-US/thunderbird/addon/lightning/versions/5.1b1 FRG Rick Collins wrote:
I just switched from T-bird to SeaMonkey and I'm still trying to get my sea legs. (pun intended) One issue is I was very dependent on the Lightning calendar in T-bird but I can't get a calendar working in SeaMonkey. I see mention that Lightning 5.1b1 should work with SM 2.46, but it doesn't for me. An item shows up in the Window menu for Calendar, but when I select it an error window pops up saying, XML Parsing Error: undefined entity Location: chrome://lightbird/content/sunbird/calendar.xul Line Number 53, Column 1:<window id="calendar-window" ^ Any ideas? I thought Sunbird was an entirely different calendar than Lightning and had been dropped some time back, no?
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