Executable won't run after compilation with R2019b

The .m file could run with no issues.

then using mcc -m myfile.m to compile, no error showed.

Execute the generated .exe file, got an "Unrecognized function or variable 'notify".

This variable is defined as

notify = char(t_data.value(6));

and the indicated section of the code shown as below. is this related to some option for compilation?

% Unspecified (system) error:

msg_text = ['Curve Fitting Execution Failed on: ', datestr(datetime('now','format', 'yyyy-MM-dd HH:mm:ss')),newline,char(13)];

if string(errormsgID) == ""

msg_text = [msg_text, SysErr.message];

MultipleRecipients = strsplit(notify,';');

sendIntMail(MultipleRecipients,'Curve Fitting Execution Error - System Generated Error.',string(msg_text));

'**** Execution aborted ****'