edit your php.ini and add/change
Code:
; Maximum allowed size for uploaded files.
upload_max_filesize = 40M
; Must be greater than or equal to upload_max_filesize
post_max_size = 40M
Then restart the relevant services.
Think that is where your problem is, big csv/text file and not being able to be uploaded.
EDIT: Just noticed you have a different error, its probably your csv file then. Hope the above helps someone else for a different problem.