I can't say for sure what is causing this but I will say this: your last line serialized the entire Validation instance into SESSION, which will require un-serialized it on the next page load. It is very possible something is getting lost/corrupt in this transition. I would advise passing something simpler, like with('errors', $validation->listErrors())

i solved it but i don't know why. Actually i just need to change into return redirect()->to('/comics/create)->withInput(); only and i can delete those $validation. Before i install Myth/Auth in my project, this code seems fine. But after i installed it i don't need ->with('validation', $validation); anymore. Anyway, thanks for your reply, we can close this issues.