Hi, I have the this same problem.
IntelliJ / Mac OS 10.14.6
gradle - build (unfortunately 19.6.3 isn’t accessible yet
on GroupDocs Java Repository Browser /java/repo/com/groupdocs/groupdocs-conversion/)
15:59:17 [https-jsse-nio-9443-exec-10] ERROR o.a.c.c.C.[.[.[/].[springServlet] - Servlet.service() for servlet [springServlet] threw exception
java.lang.IncompatibleClassChangeError: Class ch.qos.logback.classic.LoggerContext does not implement the requested interface org.slf4j.a
at org.slf4j.c.OR(Unknown Source)
at org.slf4j.c.bf(Unknown Source)
at com.joestelmach.natty.i.(Unknown Source)
at com.groupdocs.conversion.domain.documents.PdfDocument.parse(Unknown Source)
at com.groupdocs.conversion.domain.documents.PdfDocument.dp(Unknown Source)
at com.groupdocs.conversion.domain.documents.PdfDocument.a(Unknown Source)
at com.groupdocs.conversion.domain.documents.PdfDocument.a(Unknown Source)
at com.groupdocs.conversion.domain.documents.PdfDocument.a(Unknown Source)
at com.groupdocs.conversion.domain.DocumentBase.load(Unknown Source)
at com.groupdocs.conversion.domain.DocumentLoader.a(Unknown Source)
at com.groupdocs.conversion.domain.DocumentLoader.load(Unknown Source)
at com.groupdocs.conversion.domain.DocumentLoader.load(Unknown Source)
at com.groupdocs.conversion.operations.f.aK(Unknown Source)
at com.groupdocs.conversion.operations.F.execute(Unknown Source)
at com.groupdocs.conversion.converter.pdf.PdfConverter.convert(Unknown Source)
at com.groupdocs.conversion.converter.pdf.PdfConverter.convert(Unknown Source)
at com.groupdocs.conversion.handler.ConversionHandler.aJ(Unknown Source)
at com.groupdocs.conversion.handler.ConversionHandler.a(Unknown Source)
at com.groupdocs.conversion.handler.ConversionHandler.convert(Unknown Source)
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