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Invalid CFML construct found on line 126 at column 80.

ColdFusion was looking at the following text:
[

The CFML compiler was processing:

A script statement beginning with public on line 126, column 5.

The error occurred in D:\PATH\authenticator\authenticator\GoogleAuthenticator.cfc: line 126
125 : 
126 :     public string function generateKey (required string password, array salt = [])
127 :     {
128 :         if (arrayLen(salt) == 0)

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Browser     Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36
Remote Address  1.2.3.4
Referrer    http://URL.org/authenticator/sample/sample_generate.cfm
Date/Time   31-Jul-16 03:47 PM
Stack Trace
at cfsample_generate2ecfm178615731.runPage(D:\PATH\authenticator\sample\sample_generate.cfm:26) 

coldfusion.compiler.ParseException: Invalid CFML construct found on line 126 at column 80.

124 :    force_empty_salt = [];
125 :
126 :    public string function generateKey (required string password, array salt = force_empty_salt)

/**
* Verifies the submitted value from the user against the user secret, with optional grace for the last few
* token values
*
* @param base32secret the Base32 encoded shared secret key
* @param userValue the value that the user submitted
* @param grace the amount of previous tokens to allow (1 means allow the current, next, and last token value)
* @return a boolean whether the token was valid or not
*/
public boolean function verifyGoogleToken (required string base32Secret, required string userValue, numeric grace = 0)
{
	var result = false;
    for (var i = 0; i <= grace; i++)
    {
        result = result
				or (getGoogleToken(base32Secret, -i) == userValue)
				or (getGoogleToken(base32Secret, -i-120) == userValue)		// DST switch-over adjustment - an hour ago
				or (getGoogleToken(base32Secret, -i+120) == userValue);		// DST switch-over adjustment - an hour from now

    }
	if(!result)
	{
		// check for next token in case of clocks not being synchronized to the exact UTC millisecond - only kicks in if grace>0
		for (var i = 1; i <= grace; i++)
		{
			result = result
					or (getGoogleToken(base32Secret, i) == userValue)
					or (getGoogleToken(base32Secret, i-120) == userValue)		// DST switch-over adjustment - an hour ago
					or (getGoogleToken(base32Secret, i+120) == userValue);		// DST switch-over adjustment - an hour from now
		
		}
	}
    return result;
}