Error in creating a html document

[Saif178]

When, I am trying to create a html document from a dataframe produced using a function. The error is -

Error: pandoc document conversion failed with error 127

I'm using R Studio version 1.1.456 and R 3.6.1

The function is -

 function(future,df,Days=30,Region='India')
 {
    k<-data.frame(future$mean,future$lower,future$upper)
   if(Region=='India')
         n<-dim(df)[1]-1
   else
       n<-dim(df)[1]
   df$Date<-row.names(df)
   row.names(df)<-NULL
   print(paste('Forecast of COVID cases for',Days,'days after', df$Date[n],
          'in',Region))
   k[1:3]<-round(k[1:3])
   row.names(k)<-NULL
   colnames(k)<-c('Forecast','lower Confidence Interval',
             'upper Confidence Interval')
   dat<-DT::datatable(k)
   return(dat)
}