Unable to load file, I am facing this in all my app and in all type of file and image, even in classes.
can you try deleting the asset from the project and reuploading the asset.
Make a backup of your project before testing
Its not about this project i face it will new project also.
As i mention , above classes.jar, any assets, if we have any thing in assets it will cause issue. I am facing it from one or two week.
i also faced this problem , but you can ReTry to connect the companion , then they are work normally 
Yes if its big project it take 10 to 15 time try to connecti, if its new project it take 4 to 5 time try , so its a big issue.
I have find a temporary solution , create a new blank project then connect companion, go to option Myproject, then open the project you wan to open. Use this solution until the issue is solve. But that also dont work that good, so i try the beta server with the same project, and it work without any issue, smooth companion connection, so issue is with main server.
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"This new method works 100% – try it out!
Export the .aia file from Nitron Builder and import it into the Nitron Beta version. Perform a Live Test there. If everything works correctly, export the .aia file again from the Beta version and import it back into Nitron Builder. Then build the APK – and it will be done. Do not initialize OneSignal in the Blocks section, otherwise the Live Test will crash.