This was not a permanent correction, as the same error reappeared. When will we see a real solution to this problem? This error greatly complicates the task of application development for developers (myself included).
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.
Impossible to use the Niotronn companion whenever it tries to connect it shows that files are missing, the connection is not being made successfully with Niotron and every day the issue of being able to see the application in real time in Niotron becomes more complex, something that doesn’t happen with other IDEs.
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me too facing the same issue
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the same is happening to me
i can not run the compiler to test the app
when the progress indicator gets to 48% it send the message error, and always is a different jpg file that says that is unabled to load.
It happens sometimes
Try clearing companion app data, builder cookies and hard refresh.. it should work then
i did everything still the issue persists now what?
thanks a lot, it works for me, but every time that I need to connect again to the niotron companion I need to clean the cache again or the error message appears again.