Error in showing files from backendless

every thing works fine

until yesterday i got this messege:
Backendless encountered an error while handling the request. An internal trouble ticket with ID D2A34762-32D4-140C-FFF7-FB256AD7CD00 has been created and we will be investigating the issue.

did i do any thing wrong ?

Is it continuous error? May be the request have been done during server update process.
Do you receive it now? If so, please, provide you application id.

data table works fine

the problem i have uploaded pdf files to server using api
and when i want to show this files its give me this error

app ID : 59FB34A3-902F-A9A3-FF05-5E39D06AF100

i have noticed that the files with name in right to left like Arabic gives me this error
it was work perfectly what happened now ?
any help in this issue please

I’ve created the inner task to investigate the problem.
BKNDLSS-17866
All information about the progress will be posted here.

May you please give me a simple code of uploading pdf documents using android studio

You can find an example at the bottom of this page in the api guide:
https://backendless.com/docs/android/files_file_upload.html