issues on fnFilter search

I'm using data Table verison1.10 in java web applications.

oTable.fnFilter(searchString, null, false, true, true, true); is working well in data table version 1.9+... but now it is not working in data table version 1.10. while using 1.10+ version, i'l get the dataTableParamModal objet as null. Please help to solve this issue. Note : i used oTable.search(searchString).draw(); and oTable.fnFilter(searchString).draw(); functions also, but no use, same null only i got.