Gitlab CE version error when creating project and push

hello everybody, i have some problem with Gitlab CE that i deploy in raspberry pi
The first problem : few weeks ago, i still create a project with no problem, but today when i create it alerts “Unable to save project: Cannot allocate memory - /opt/gitlab/embedded/service/gitlab-shell/bin/gitlab-projects” like the below image

The second problem : i push to a existing project, when finishing, i cant enter the page of the project in gitlab, it shows “404 The page you’re looking for could not be found. Make sure the address is correct and that the page hasn’t moved. Please contact your GitLab administrator if you think this is a mistake.” like the below image

Thanks for your helps