录制测试上传文件脚本，回放报Warning -26490: File name in a multipart submit is missing or empty. Using an empty file [MsgId: MWAR-26490]。
经过几天努力，总算解决了此问题，先看以前的脚本： web_submit_data("GeneralReport.aspx_2",
"Action=http://192.168.0.80/pbcmsc/GaiSuan/GeneralReport.aspx?taskid=0e1d66f8-4ecd-42a7-8f9e-e79f6733e992",
"Method=POST",
"EncType=multipart/form-data",
"RecContentType=text/html",
"Referer=http://192.168.0.80/pbcmsc/GaiSuan/GeneralReport.aspx?taskid=0e1d66f8-4ecd-42a7-8f9e-e79f6733e992",
"Snapshot=t11.inf",
"Mode=HTML",
ITEMDATA,
"Name=__EVENTTARGET", "Value=", ENDITEM,
"Name=__EVENTARGUMENT", "Value=", ENDITEM,
"Name=__VIEWSTATE", "Value={Siebel_Analytic_ViewState6}", ENDITEM,
"Name=__EVENTVALIDATION", "Value=/wEWBQLi6rucCgKxyJGqCQLgqY6fBALq+76DCwLt3oXMA+v3KRNiiYlPYq+7WLq5K9a+OZs4", ENDITEM,
"Name=ddlVersion", "Value=送审版", ENDITEM,
"Name=txtBelongToPackage", "Value=GOOD-3", ENDITEM,
"Name=txtDemo", "Value=", ENDITEM,
"Name=fuPrj", "Value=F:""""test1.bwbd5", "File=Yes", ENDITEM,
"Name=mu2$multipFile", "Value=", "File=Yes", ENDITEM,
"Name=btnUpload", "Value=上传", ENDITEM,
"Name=dxpcCommonWinWS", "Value=1:1:12000:237:238:0:0:0", ENDITEM,
LAST);
通过了解web_submit_data函数及各参数，发现fuprj和mu2$multipFile都是上传附件的路径。我就想是不是fuprj第一个成功，mu2$multipFile为空是会失败，并报该错，给他赋值一个上传文件（mu2$multipFile的Value= F:""""test1.txt），结果二个都上传成功！
转：Warning -26490: File name in a multipart submit is missing or empty.解决方法
原文：http://www.cnblogs.com/lci05/p/3978219.html