Unable to open discovr_09 :comparing two means

[drDawood97]

When I try to preview discovr 9 this message appears

"processing file: discovr_09.Rmd

Error in t.test.formula(): ! cannot use 'paired' in formula method Backtrace:

1. stats::t.test(...)
2. stats:::t.test.formula(...)

Quitting from lines 511-515 [unnamed-chunk-11] (discovr_09.Rmd) Execution halted"