Flex 编译CSS文件的错误：Invalid Embed directive in stylesheet
今天试图重新改变现有的CSS Framework，放弃之前自定义的CSSLoader，采用运行时加载CSS的方式。
不过目前还是做尝试，需分析两种方式所能处理的各种情况，找出需要处理的特殊情况，然后分析是否值得更改。
采用运行时加载CSS的方式
需将CSS文件预编译成SWF文件，看了网上提供的方式，发现直接在Flex Builder中compile，找不到生成的SWF文件。。也不是很了解其中的机制，于是采用另外一种方式，切换到Flex Builder的安装目录，找到SDK下的bin目录mxmlc.exe，执行，输入命令mxmlc path/test.css,然后在path下会生成相应的test.swf。
不过在编译的时候出现错误：
Invalid Embed directive in stylesheet - can't resolve source 'Embed("/assets/test.png")'搜索了半天发现中文只有少量帖子关于这个问题，但是并没有解决方案，于是切换搜英文的，果然发现很多相关帖子，简而言之根本原因就是Embed中提供的路径有问题，编译时无法根据给出的路径找到相应的文件。
下面贴出解决方案以及一些有用的回复，我就懒得翻译了，反正大部分人都能看懂英文：
Onafewoccasionsnow,fornoreallyapparentreason,suddenlyourProblemPanewillbespammedwithtonsofmessagesallsortoflookinglikethis:
InvalidEmbeddirectiveinstylesheet-can'tresolvesource'Embed(source="/assets/common.swf",symbol="AccordionHeader_disabledOverSkin")'.
Inthepast,sometimesitwouldonlyhappenonamac,othertimeswindowsmachines.I'vetrieddeletingmybinfolder,cleaningtheproject,recompilingtheswf's,movingtheswf'saround,changingthesyntaxinthecsseversoslightly.I'vegoogledthisonmanyoccasionsandfoundnoclearanswer.TodayIdecidedthatIneededtoknowwhatcausedthisandifinfactIfigureditout,toshareitwithyou.
Whatendedupbeingtherootcauseofourproblemisthatinseveralplacesintheapplicationwewerereferencingimageassetsdirectlyinourassetsfolder,i.e./assets/delete.png,whichisoftenthecasewhenourdesignersaren'tkeepingupwithassetcreationanddevelopersjustthrowsomeimageupasaplaceholderforthetimebeing.NowitjustsohappenedthatONEofthesereferenceswasincorrectanditsEmbedpointedtoafilethatdidnotexist.IdiscoveredthiswhenIcommentedoutourstylecssreferencesintheapplication,andsawtheerroronlythen.Itwasthisbrokenreferencethatcausedtheaboveerror.Ifixedthereferencetopointtotherightfile,didaProjectclean,andalltheInvalidEmbedDirectiveerrorswentaway.
Ishouldnotethatwehadover100referencestosymbolsinourcss,andbydefaultFlexbuilderonlyshowsthefirst100errors.Unluckilythe"unabletoresolve'assets/deleted.png'fortranscodingin...."waserrornumber138anddidnotshowupinthelist.Ihadtochangemypreferencestoshowall138errors.
Sothelessonlearnedisthatwhenyougetspammedwiththiserror,itcouldwellbethatonlyoneEmbedtagsomewhereinyourappisactuallybroken,andthatyourcssandswfisprobablyjustfine.
符合我的情况的回复：