The error to my understanding is that when you exported the file, it now wants to run in debug mode. Which it cannot do since it is exported and no longer in C2. I have two suggestions the first being hopefully the easiest. Make sure that in the project properties panel that the default way to launch the games in the editor is localhost:50000. It could be as simple that your C2 file is setup to automatically run in debug which in turn is affecting your export. Then try to re export for the Scirra arcade.
If that doesn't work then it gets harder to actually do as this requires manually editing the "config.html" file and you will need a file editor(hopefully notepad will do) we are doing the second one of the suggested fixes from the report.
1 Open the folder of the game you exported
2 edit the file that says config
3 Copy and paste the
<configuration>
<system.web>
<compilation debug="true"/>
</system.web>
</configuration>
into your file. At the top should be fine.
If that works then know that when you launch the game it will be in debug mode. see "Note that this second technique will cause all files within a given application to be compiled in debug mode." So you really need to try to get my first suggestion to work so when you export your next attempt will run smoothly
I try to make it simple to get across, but explaining tech issues across language barriers is difficult.
Also https://www.scirra.com/tutorials/82/uploading-to-the-scirra-arcade Is the turorial for uploading to the scirra archade
Look at "Currently the Arcade only supports the built-in plugins and behaviors, except for the platform specific plugins (like the Windows 8 object). Also, the Browser object has limited features on the Arcade: any actions which can navigate to a different page are blocked for security reasons." Dose your game run useing any downloaded plugins or behaviors? That too can be the problem.