So I keep getting a ' internal error: pack_blocks: empty list.' error when I do some of the HTML parsing. Does anyone know why this error might occur?

Here is my whole log, but the other errors seem to be ok for some pages, but not others...

Tue Apr  3 11:31:26 2012: ---- begin
Tue Apr  3 11:31:26 2012: Loading document...
Tue Apr  3 11:31:26 2012: -:151: error: Tag header invalid
Tue Apr  3 11:31:26 2012: -:155: error: Tag nav invalid
Tue Apr  3 11:31:26 2012: -:237: error: htmlParseEntityRef: no name
Tue Apr  3 11:31:26 2012: -:666: error: Tag footer invalid
Tue Apr  3 11:31:26 2012: -:669: error: Tag nav invalid
Tue Apr  3 11:31:26 2012: -:759: error: ID popup_login_email already defined
Tue Apr  3 11:31:26 2012: -:763: error: ID popup_login_password already defined
Tue Apr  3 11:31:26 2012: -:871: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:873: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:875: error: Unexpected end tag : h1
Tue Apr  3 11:31:26 2012: -:876: error: Unexpected end tag : span
Tue Apr  3 11:31:26 2012: -:876: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:877: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:878: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:879: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:880: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:883: error: Unexpected end tag : h1
Tue Apr  3 11:31:26 2012: -:888: error: Unexpected end tag : span
Tue Apr  3 11:31:26 2012: -:890: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:891: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:895: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:896: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:898: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:899: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:900: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:904: error: Unexpected end tag : h1
Tue Apr  3 11:31:26 2012: -:907: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:907: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:909: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:910: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:911: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:913: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:918: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:923: error: Unexpected end tag : span
Tue Apr  3 11:31:26 2012: -:924: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:925: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:927: error: Unexpected end tag : h1
Tue Apr  3 11:31:26 2012: -:928: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:928: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:930: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:931: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:932: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:933: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:934: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:935: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:936: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:937: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:939: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:939: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:939: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:940: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:941: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2658: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2661: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2662: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2663: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2665: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2666: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2667: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:2668: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2676: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2678: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2679: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2680: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2685: error: Unexpected end tag : option
Tue Apr  3 11:31:26 2012: -:2686: error: Unexpected end tag : option
Tue Apr  3 11:31:26 2012: -:2687: error: Unexpected end tag : option
Tue Apr  3 11:31:26 2012: -:2688: error: Unexpected end tag : select
Tue Apr  3 11:31:26 2012: -:2689: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2690: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2692: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2693: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2701: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2703: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2704: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2705: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2710: error: Unexpected end tag : option
Tue Apr  3 11:31:26 2012: -:2711: error: Unexpected end tag : option
Tue Apr  3 11:31:26 2012: -:2712: error: Unexpected end tag : option
Tue Apr  3 11:31:26 2012: -:2713: error: Unexpected end tag : select
Tue Apr  3 11:31:26 2012: -:2714: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2715: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2717: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2718: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2723: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:2723: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2724: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:2724: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2725: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:2727: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:2728: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2730: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:2731: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2732: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2737: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:2737: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2738: error: Unexpected end tag : a
Tue Apr  3 11:31:26 2012: -:2738: error: Unexpected end tag : li
Tue Apr  3 11:31:26 2012: -:2739: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:2741: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:2742: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2744: error: Unexpected end tag : ul
Tue Apr  3 11:31:26 2012: -:2745: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: -:2746: error: Unexpected end tag : div
Tue Apr  3 11:31:26 2012: http://aram.dev.bright.com/static/v3/css/libs/jquery.jgrowl.css: warning: failed to parse all CSS rules
Tue Apr  3 11:31:27 2012: Converting document...
Tue Apr  3 11:31:27 2012: internal error: pack_blocks: empty list.
Tue Apr  3 11:31:27 2012: ---- end

We've recently fixed this error, please email me (mikeday@yeslogic.com) if you are interested in trying an updated Prince build.