output: powerpoint_presentation
classoption:"aspectratio=169"
hi, I need custom the presentation width/height=16:9, but it turns out that
Error in yaml::yaml.load(..., eval.expr = TRUE) :
Scanner error: while scanning a simple key at line 3, column 1 could not find expected ':' at line 4, column 1
Calls: ... parse_yaml_front_matter -> yaml_load ->
Execution halted
Why?