Setting a variable equal to a local macro in a foreach loop

[Will Lake]

quietly{
    levelsof id, clean local(url)
    foreach x of local url{
        copy "http://www.ufcstats.com/fighter-details/`x'" "fighter`x'.txt", replace
    }
}
//generate clean career data for each player
quietly{
    foreach x of local url{
        clear
        import delimited using fighter`x'.txt, rowr(139:193)
    
        g careerStats = strmatch(v1, "*<*")
        drop if careerStats == 1
        replace careerStats = mod(_n,2) == 1
        keep if careerStats == 1
        g str id = `x'
        g slpm = v1
        g strAcc = v1[_n+1]
        g sapm = v1[_n+2]
        g strDef = v1[_n+3]
        g tdAvg = v1[_n+4]
        g tdAcc = v1[_n+5]
        g tdDef = v1[_n+6]
        g subAvg = v1[_n+7]
        drop v1 careerStats
        keep in 1
    
        save `x', replace
    
    }
}

The code pulls data from a list of urls by cycling through unique ids for each page. I need the id for each specific webpage to be in each new data set I create so that I can append them to the larger data set I have created.
I'm hitting an error when I get to the line: g str id = `x'. Stata is shooting back an error(198) when I attempt to generate the variable.

* Example generated by -dataex-. To install: ssc install dataex
clear
input str16 fighter
"93fe7332d16c6ad9"
"15df64c02b6b0fde"
"b361180739bed4b0"
"2f5cbecbbe18bac4"
"c0ed7b208197e8de"
"5140122c3eecd307"
"c9f6385af6df66d7"
"aa6e591c2a2cdecd"
"7279654c7674cd24"

This is a portion of the ids that the program runs through. Thank you ahead of time!

[Clyde Schechter]

gen str id = `"`x'"'