Cannot download .apk

Everytime I try to download an .apk i get this error message. Timeout while fetching URL: http://newblocksbuildserver.appinventor.mit.edu:9990/buildserver/build-all-from-zip-async?uname=%40gmail.com&callback=http%3A%2F%2Fnb147a.391404739479945987.mit-appinventor-newblocks.appspot.com%2Fode2%2Freceivebuild%2Fd78oe2lahc1emelol2hsskxily96h85oj0bytosg57m31l30h0m15uwr2nx55e9msrpgocorew9b8o55vxk0gweuet08wkxnyv9rumgm717607m3nx1ea3ml3f2t6v3oj26r0paayf%2Fbuild%2FAndroid 

Thanks for any comments or support!

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probably too many assets like images, audio files or videos? how much do you have?

how many screens does the app have?

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