带有grep的if语句出错

Running the following code:

运行以下代码:

if(grep("sales", resume$jobs$title, ignore.case = TRUE, perl = FALSE, value = FALSE,
     fixed = FALSE, useBytes = FALSE, invert = FALSE)) {p2_feature = 1}
else if(grep("\$[0-9]+",resume$jobs$text,ignore.case = TRUE, perl = FALSE, value = FALSE,
             fixed = FALSE, useBytes = FALSE, invert = FALSE)){p2_feature = 1}
else {p2_feature = 0}
if(grep