github - ERROR: Permission to user1/repo.git denied to user2 -

someone know trying clone github repo , make changes directly it. it's public repo. he's cloned read-write access link , can pull repo. problem when tries push gets error

error: permission user1/repo.git denied user2

where he's user2 , i'm user1. i've allowed other people use different repos before , i've never had problem. missing allow him access or did github change? i've seen on page github:

this error occurs when attach key deploy key on repo1. can push , pull repo without issue, won’t have access other repo key. solve this, remove key repo1’s deploy keys , attach on account page instead. key have access repos account has access to.

we haven't messed deploy keys, can't find other solution on web.

i stupid , didn't add them collaborators.

to this, follow these instructions:

1. go repository > admin > collaborators
2. you see text box add button. in order add collaborator start typing in text box until see actual username suggested in drop down list appears type.
3. select username cause green check mark appear indicating system recognized username.
4. press add add collaborator repository.

you can watch octocast: http://screencast.com/t/m7yn19n4645h