Niečo podobné som riešil aj ja, tento návod aspoň mne zabral:
Error code 800700E8: You are getting this error due to a conflict with the "Rock Band Song Exporter License" file on your storage device. That file is there if you (or someone else) exported the songs from Rock Band 1. You will need to delete this file. 1. WARNING: You will NEED to exit your current session in LEGO Rock Band to follow these steps. Any unsaved progress will be lost. 2. Press the Xbox Guide button on your controller (the one with a big green X on it) 3. Select "Xbox Home" and choose "Yes" 4. Go to the "Settings" tab 5. Select "System" 6. Select "Storage" 7. Select "Hard Drive" (or other storage device) 8. Select "Games and Apps" 9. Select "Rock Band" 10. Select the file titled "Rock Band Song Exporter License" 11. Select "Delete" and then "Yes" to delete the file 12. Press the Xbox Guide button on your controller (the one with a big green X on it) 13. Select "Play LEGO Rock Band" 14. Select "Music Store" 15. Select "Export Download" to export the LEGO Rock Band tracks to your Xbox 360 console. 16. Follow the on-screen instructions to purchase and download the export pack.
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