I keep getting this error when Checking my package {disk.frame} on the
latest R devel version.
```
Attaching package: 'data.table'
The following object is masked from 'package:purrr':
transpose
The following objects are masked from 'package:dplyr':
between, first, last
> cars.df = as.disk.frame(cars)
> as.data.table(cars.df)
Error in print.default(toprint, right = TRUE, quote = quote) :
invalid 'useSource' argument
Calls: <Anonymous> -> print.data.table -> print -> print.default
Execution halted
```
But if I just run the code in the example normally in the REPL then
everything runs fine.
I do my checking in Windows 10 using these commands.
```r
remotes::install_github("xiaodaigh/disk.frame", ref="development")
devtools::check()
```
Is this a known bug? Can I still submit to CRAN?
--
ZJ
zhuojia....@gmail.com
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