Excel importer missing slf4j error

I recently added the excel importer module to a project, and configured a basic import. Unfortunately it seems that I get a missing class definition error when running it in Mendix.

This error gets triggered on the "GetHeaderInformationFromExcelFile" java action, and when debugging in eclipse I get the following error:

SLF4J: Failed to load class "org.slf4j.impl.StaticMDCBinder".
SLF4J: Defaulting to no-operation MDCAdapter implementation.
SLF4J: See http://www.slf4j.org/codes.html#no_static_mdc_binder for further details.

On the following line:

this.ExcelFileDocument = _ExcelFileDocument == null ? null : excelimporter.proxies.TemplateDocument.initialize(getContext(), _ExcelFileDocument);

Does anyone have a solution for this issue?