Eclipse rcp help content not working after migration from eclipse indigo to 4.16

I am working on and eclipse rcp project which is written in indigo. I had migrated it from indigo to eclipse 4.16 using compatibility layer.
The migration was successfull but I am facing issue in launching the help content of the application. 
On launch through eclipse, the help screen doesn’t show up and there is no error message. 
When we launch through installer, We receive the following error




As I checked in run configurations, some plugins(org.eclipse.equinox.http) are unable to resolve javax.servlet which is present in target platform and is selected.
Could this isssue be around javax.servlet? How could I resolve it as that jar is already present. Or could it be some other problem that I am missing.
Please help.