Rmarkdown 编织失败，出现“无法启动 png（） 设备”错误

问：

我还有其他我编织的情节，但我在这个特定的情节中遇到了错误。我将打印格式从 png 更改为 pdf，但它仍然给我同样的问题。

processing file: BellaBeat_data_analysis_Report.Rmd
  |..........|  95% [Question 2. How do daily step counts correlate with daily calories burned?]               
Quitting from lines 410-447 [Question 2. How do daily step counts correlate with daily calories burned?] (BellaBeat_data_analysis_Report.Rmd)
Error in `png()`:
! unable to start png() device
Backtrace:
  1. rmarkdown::render(...)
  2. knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet)
  3. knitr:::process_file(text, output)
  8. knitr:::process_group.block(group)
  9. knitr:::call_block(x)
     ...
 18. base::mapply(...)
 19. knitr (local) `<fn>`(...)
 22. knitr:::plot2dev(...)
 24. knitr (local) `<fn>`(...)
 25. grDevices::png(..., res = dpi, units = "in")
Warning messages:
1: In png(..., res = dpi, units = "in") :
  unable to open file 'BellaBeat_data_analysis_Report_files/figure-html/Question 2. How do daily step counts correlate with daily calories burned?-1.png' for writing
2: In png(..., res = dpi, units = "in") : opening device failed
                                                                                                                                                                                      
Execution halted