Minecraft staging launcher crashes after one use

When I use the minecraft staging launcher once, it opens and runs fine, saying downloading native launcher then it opens fine, but after I quit minecraft and come back to it it just says that it has an error moving some files and I have to go back to the old launcher then click reset settings then I can play the normal launcher fine, but then when I want to use the staging launcher it lets me once then the moving error happens again. Please fix Mojang!