Steam/Linux Issues -- User Cannot Run Game Through Steam or by Navigating to Folder and Launching

So I know I'm really new to this, but I feel like I might have got baited a bit on the "ease" of this program's export function. Construct positions itself to being able to export to various platforms just by clicking some toggles in the export side of things, but I'm having the worst time getting users to be able to play my game on Linux. This is embarrassing for me, because for someone who is just starting out, it's not a good look when I'm advertising a game to be compatible with Linux, only for folks to run into issues. I realize that it may NOT be the game or the program's fault, but trying to understand these errors that are being reported to me will help me know if I did something wrong.

The errors the user is receiving are the following:

(AlpacaSprint:76844): Gtk-WARNING **: 00:46:40.955: Theme parsing error: gtk.css:6363:24: 'none' is not a valid color name

[76844:76844:0528/004641.035196:ERROR:nacl_browser.cc(288)] Failed to open NaCl IRT file "/home/[USER]/ext/steam/steamapps/common/AlpacaSprint/linux64/nacl_irt_x86_64.nexe": -4

[76844:76874:0528/004641.044653:ERROR:gpu_init.cc(162)] Vulkan not supported with in process gpu

[76880:76889:0528/004641.450133:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

[76880:76884:0528/004641.653064:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

[76880:76884:0528/004641.938562:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

[76880:76884:0528/004642.253960:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

[76880:76884:0528/004642.670059:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

[76880:76884:0528/004646.247771:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

[76880:76884:0528/004655.513345:ERROR:cert_verify_proc_builtin.cc(592)] No net_fetcher for performing AIA chasing.

Does anyone know what these are and what they mean? A quick search of the forums yielded no results on any of these issues.

Folder issue was my fault. Steam has a weird way of handling distributions for multiple platforms, so that was a learning curve thing. With that fix, the errors went away, so whoops, my bad.