SuperMemo error: Element missing from the priority queue

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Sent: Wednesday, February 23, 2011 5:52 AM
Subject: SuperMemo error: Element missing from the priority queue

Question

Element missing from the priority queue
Element #0

Setting the maximum priority!"
--------------------DETAILS--------------------
SuperMemo 2008 (Build 14.04, Feb 18, 2010)
Time: ?? 23, 2011, 12:51
--------------------COLLECTION STATISTICS
Collection       D:\SuperMemo2008\systems\GRE_JingXuan
??             2011-2-23 (???)
??             2011-1-25
??             30 day(s)
??             8345 ?.
??+??        8255+90 ?.
????         4302 ?. (52.1%)
??????     4302 ?. (100%)
??????     0 t. (0%)
??????     143.4000 ?/? 
???           3953 ?.
????         90 ?.
????         482+0 ?.
????         83.48%
??FI?         31.11% 
??FI?         10.00% (10%)
???           729.070+0
????         No change
???           1h 3m 51s
??             -
??             -
??             0 sec. (0 sec.)
????         5.255 ? .
???           1d 20h 11m 35s
???           0.976 (0)
??             820 ?/?/?  
??             0.616 ?/? .
????         0.445 ?/? .
??             12 day(s)
????         2.824 ?  .
????         30,277
????         2011-2-18
????         2011-3-2
?????       2011-3-23
A-Factor         4.1234
Text Registry    16497 entries
Lexicon          0 words
FI Cases         13992
--------------------SYSTEM DATA
Windows XP 5.1 (Build 2600) Service Pack 3
Internet Explorer 7.0 (0) Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0)
User language: zh-cn
System language: zh-cn
Browser language: zh-cn
User: Administrator
Total physical memory: 2.11 GB
Free physical memory: 1.56 GB
Page file: 4.1 GB
Free page file: 3.57 GB
Virtual memory: 2.15 GB
Free virtual memory: 2.06 GB
Extended virtual memory: 0 bytes
Heap memory: 3.88 GB
Free heap memory: 1.44 GB
Heap memory use: 63.04%
Active Code Page: 936
OEM Code Page: 936
Network installed

Answer