The error is due to the fact that some library referenced in Weblogic.xml is not used during deployment.
try calling all link libraries through run (Windows). For example, if you have a link to a library named \ systemlib \ alllibs \ lib1.jar, then run it and try calling the library file or viewing it manually if you can access the file on the server.
If the file is present, then for the unix / linux server, check if there are any permissions in the system. for example, if the library was placed by the root user, and the weblogic user (application server) does not have read or write permissions to the library folder. Remove such problems.
Finally, since the error specifically says JSTL, so check to see if the JRE and JSTL versions are in sync.
If the error still persists, please share also with weblogic.xml
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