when I try to use the batch download. im getting alot of failed download.

heres the log:
Batch tile dl working... (threads: 29) pending: 8495, done: 51
exception in get tiles thread:
the downloaded tile is not an image as per its magic number (it is probably an error response webpage returned by the server)
Batch size working... (threads: 29), pending: 8245, done: 286
Batch tile dl working... (threads: 29) pending: 8494, done: 52
exception in get tiles thread:

btw, im using google map and storage as sqlite. Thanks!