@Erock2018.1 and @Thoeme are right. Took me a lot of tinkering, trial and error, but the main issue is duplicating the project. Whether it be through unreal or in windows explorer, if you change the names of the file, existing blueprints, meshes, textures etc. in the new duplicated project it’ll cause this issue.
The best solution is sticking with the naming used in the file, blueprints, textures, meshes etc. But if it is necessary to change the name make sure you do the following:
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As @Thoeme mentioned, delete the entire ‘Binaries’, ‘Intermediate’ and ‘Saved’ (except the ‘Config’ file in ‘Saved’) folders in windows explorer (wherever you have saved your project)
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Go through every remaining folder and edit the necessary .ini (configuration files) via notepad and make sure the referenced blueprints, file name, texture, mesh files etc. (whatever has been changed) matches
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Once everything is changed/updated, reopen the project file in unreal and under ‘Project Settings’ - ‘Android’, you’ll have to reclick ‘Configure Now’ for the ‘APK Packaging’ and ‘Google Play Services’
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Save and try quick launch to mobile again. The error should disappear
Hope this helps
*Edit: This worked for me in UE5.1.1. I haven’t tried this in prior versions