I am getting java compiling Error while deploying the app

i am getting the java compiling Error while deploying the app  the java error code here below   Buildfile: C:\Users\Admin\Documents\Mendix\App-main_2\deployment\build_core.xml compile:     [javac] Compiling 130 source files to C:\Users\Admin\Documents\Mendix\App-main_2\deployment\run\bin     [javac] C:\Users\Admin\Documents\Mendix\App-main_2\javasource\simplecsvexporter\actions\AppendContentToFile.java:18: error: package org.apache.commons.lang does not exist     [javac] import org.apache.commons.lang.StringUtils;     [javac]                               ^     [javac] C:\Users\Admin\Documents\Mendix\App-main_2\javasource\simplecsvexporter\helpers\CSVFile.java:14: error: package org.apache.commons.lang does not exist     [javac] import org.apache.commons.lang.StringEscapeUtils;     [javac]                               ^     [javac] C:\Users\Admin\Documents\Mendix\App-main_2\javasource\simplecsvexporter\actions\AppendContentToFile.java:114: error: cannot find symbol     [javac]         String rest = StringUtils.join(pathParts,"/");     [javac]                       ^     [javac]   symbol:   variable StringUtils     [javac]   location: class AppendContentToFile     [javac] C:\Users\Admin\Documents\Mendix\App-main_2\javasource\simplecsvexporter\helpers\CSVFile.java:68: error: cannot find symbol     [javac]             strval = StringEscapeUtils.escapeCsv(String.valueOf(value)).replaceAll("\"", "");     [javac]                      ^     [javac]   symbol:   variable StringEscapeUtils     [javac]   location: class CSVFile     [javac] Note: Some input files use unchecked or unsafe operations.     [javac] Note: Recompile with -Xlint:unchecked for details.     [javac] 4 errors BUILD FAILED C:\Users\Admin\Documents\Mendix\App-main_2\deployment\build_core.xml:29: Compile failed; see the compiler error output for details. Total time: 5 seconds
1 answers

The error is saying there is a missing jar file in your userlib.

Was this project developed in an earlier version of Mendix and updated to 9.2? If it was, try reinstalling the SImpleCSVExporter module from the Marketplace.