File should not contain more than 39 rows

I tried to import some leads in excel format. First I was able to upload, then I received an error 'File should not contain more than 135 rows', so I reduced the rows. But then, I received another error 'File should not contain more than 39 rows'. I tried reducing the rows even to 20 but still get the same message. Tried making a new file, logging out of zoho but still the same result. HELP