afl help needed

#1
hi,

can anyone tell me whtz wrong with 8_Indicator_TS for Amibroker.afl.
i downloaded this afl from net...working fine till last wk now giving error as

VBM = WriteIf(MFI_Buy,VBM + "MFI ",VBM);
VSM = WriteIf(MFI_Sell,
----------------------^

Error 29.
Variable 'mfi_sell' used without having been initialized.

please let me know what went wrong now

code for afl is in attachment
 

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