Using loop for tabout command

I am running the following command:

Code:

foreach var of varlist ` Age - Region Smoking Alcohol ' {
 
tabout   `variable' using test.txt, append

}

but getting an error:

Code:

varlist required
r(100);

Same thing is happening when using the tabulate command alone:

foreach var of varlist ` Age - Region Smoking Alcohol ' {
tabulate `var'
}

Can anyone please help detect the source of the error?

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