如何fix Vigentte CMS DBselect 出现Null的问题

在CMS中，我们要注册DBselect，但是有时候会有个Null的错误，解决方案是

Try to compare the two jar files (thirdparty-combined.jar and vgn-appsvcs-cma.jar) inside vmcext.war and /Content/7_3_1/lib/sdk directory.

If they are not same, update these jar files inside vmcext.war with the files from /Content/7_3_1/lib/sdk directory. And redeploy the vmcext.war file.