! LaTeX Error: File `ecrc.sty' not found.
Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: sty)
Enter file name:
! Emergency stop.
<read *>
l.7 ^^M
*** (cannot \read from terminal in nonstop modes)
Here is how much of TeX's memory you used:
2735 strings out of 480681
32117 string characters out of 5908536
266899 words of memory out of 5000000
18590 multiletter control sequences out of 15000+600000
533028 words of font info for 26 fonts, out of 8000000 for 9000
1141 hyphenation exceptions out of 8191
38i,0n,34p,238b,86s stack positions out of
5000i,500n,10000p,200000b,80000s
! ==> Fatal error occurred, no output PDF file produced!'
.sty 文件已包含，但错误消息显示未找到。为什么？