"The Microsoft Jet database engine could not find the object 'Customers'. Make sure the object exists and that you spell its name and the path name co

I am getting one error while importing the file which contains the list of customers.

the error is coming as below
"The Microsoft Jet database engine could not find the object 'Customers'. Make sure the object exists and that you spell its name and the path name correctly."

What steps i have taken are as below.

1. Export the list from the admin
2. followed same format for new customers in excel file.
3. and tried to import into customers.
4. my sheet name is also "Customers"
5. i have also checked that, the file is importing to ExportImport folder on server, but it's not importing.

so at that time i am getting the above error

Is there anybody help me out in this.

Thanks
Jigar.