Warning in dcast(., Date ~ temp, fun = sum, fill = 999999.99)

[MehrdadHeyrani]

Hi,
I am trying to run this Shiny with different daily data set, with same column name as example "dataset.csv" I am getting this error:

Listening on http://127.0.0.1:6292 Warning in dcast(., Date ~ temp, fun = sum, fill = 999999.99) : The dcast generic in data.table has been passed a data.frame and will attempt to redirect to the reshape2::dcast; please note that reshape2 is deprecated, and this redirection is now deprecated as well. Please do this redirection yourself like reshape2::dcast(.). In the next version, this warning will become an error. Warning: There are NA values in the column Date. The records with NA values are returned in the final rows of the dataframe. Warning in min.default(numeric(0), na.rm = FALSE) : no non-missing arguments to min; returning Inf Warning in max.default(numeric(0), na.rm = FALSE) : no non-missing arguments to max; returning -Inf Warning: Error in : start value is larger than the end value.
Any idea what is the issue here?
Thanks