Offline Server error: could not upload project


hello i successfully install offline server but when i use any button or any upload any aia file or build apk file then this error show on top of screen. please tell me where problem.
Server error: could not upload project. Please try again later!


Did you try to upload .aia that was exported from online AppyBuilder?


yes i try. i download aia files. and try to upload in offline version then same error showing.
in my 1st laptop every thing working fine. but my 2nd laptop showing error. same error showing in my friend laptop.