It seems as if the application feels to load any/all platform libaries. When looking at the detailed errors, I noticed that each of your error messages is mentioning the following statement: [caused by: Unable to resolve 40.0: missing requirement [40.0] osgi.ee; (&(osgi.ee=JavaSE)(version=1.8))
This indicates that it is missing the requirement of Java 8, can you please check and confirm that you are running the platform will all requirements, based on the error message it looks as if you are running on Java 6 or 7 but for Mendix 6 you must use Java 8 to run the platform.