Hi Chetu,
Based on the stack trace this does sound like a JAR file issue. When upgrading marketplace modules to new version prior to Mendix 10 the old versions of JAR files are left in place.
Open the project folder in windows explorer and navigate to the userlib folder, this is where the JAR files are stored. You will need to look for duplicates and remove them. After removing the duplicates you will need to clean your deployment directory, this can be done in Studio Pro using the Clean Deployment Directory from the App menu.
The documentation for the Excel Importer includes some details about which JAR files to look for:
5.10 After Upgrading to the Latest Version of Excel Importer, userlib Contains Two Files of the same JAR. How Should I Resolve This?
It is possible that you may see, for example, commons-io.commons-io-2.11.0.jar and commons-io-2.11.0.jar in the userlib folder after upgrading. This is because the naming convention of the JARs is aligned to just have the file name. In such cases, you can safely delete the JAR which uses the package prefix (in this example’s case, delete commons-io.commons-io-2.11.0.jar).