problem in BDC ECC 6.0

I have created a BDC in ECC 6.0 , when I am executing it after all coding it is not accepting the file (nethier in notepad nor in excel) thats why it is not uploading the data in the screen, can anybody help me to resolve this and tell me why it is happening? it is not showing error but not accepting the file.

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Moni Bindal