When dealing with big excel in R, java.lang.OutOfMemoryError, how to save big excel with ffbase?

Question

I was stuck at the last step, saving my excel.

The error is :

Error in .jcall(cell, "V", "setCellValue", value) : 

java.lang.OutOfMemoryError: GC overhead limit exceeded

therefore I searched and tried:

> options(java.parameters=’-Xmx4g’)
Error: unexpected input在"options(java.parameters=’"里

And it doesn’t works,should I download any other package to run it?

Also, I checked ffbase, however

I don’t quite understand how to use it in real, I simply need to save my file as excel, didn’t see much real case on the internet.

> ffsave(dirtydata2, file="~/dirtydata2.xlsx")
Error in dirname(filelist[[1]]) :数```

Also,I’m so sorry for my such basic questions.
Any learning website suggest for such level?
The help document does not have much real case.

Thank you for your time and patience.