R Error: $-Operator is Invalid for Atomic Vectors (Example) | How to Fix | is.atomic & is.recursive

How to fix the error message “$ operator is invalid for atomic vectors” in the R programming language. More details: statisticsglob...
R code of this video:
vec ＜- 1:5 # Create named vector
names(vec) ＜- letters[1:5]
vec # Print named vector
data ＜- data.frame(as.list(vec)) # Convert named vector to data.frame
data # Print data frame
vec$a # Applying $-operator to data frame
data$a # Applying $-operator to data frame
is.atomic(vec) # Apply is.atomic function to vector
is.recursive(vec) # Apply is.recursive function to vector
is.atomic(data) # Apply is.atomic function to data
is.recursive(data) # Apply is.recursive function to data
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