How to implement lookup on a flatfile in Data Integrator

Hi,
I am trying to lookup for a value in flatfile. My scenario is follows:
File-1 is my source, File-2 is lookup source. I am trying to pass column value from file-1 to lookup on File-2, but I am not able to implement a look up on file, DI is giving error on lookup does not exists.
Please let me know the way to pass path of the file while creating a lookup on flatfile.
Thanks,
Phani

what is the version of DI ?
can you give the complete lookup_ext() function call that you are using ?
did you use funtion wizard to generate the function call or typed the complete function call with arguments?
is this error coming on validation or run time?

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SAP Intelligence Platform & NetWeaver RIG APJ Expert Call
Dear valued SAP Experts,
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How to implement lookup on a flatfile in Data Integrator

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