Two issues: file hiding, char per char error reporting

Hello, I'm having two issues I don't know how to solve:

1. A file YAML got hided and I don't have any idea on how to show it back, I have no clue if I done accidentally something that triggered this but I don't currently know how to fix this. That was an essential file to let the plugin I'm making work and I need to have access to it to modify its content continuously.

2. On a specific module where I use UTF-8 like in others, I got this pretty weird issue that doesn't let me build the artifact to its path reporting me an error that says that some characters (chosen pretty randomly as far as I can see) of the first line of a class (looks to target the last class I opened or selected of that module)  are not supported also if those are just specifying normally the package the class is in without using any type of alternative letters also if, to be honest, I use a non-international keyboard but, I reiterate, I don't use its special characters at least on the package specifying because I'm aware that those won't let the plugin work, I may have used in the past those in strings but I preferred to avoid this too.