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Anyone just starting out their vim customization journey is bound to run into this error.
E5520: <Cmd> mapping must end with <CR>
I did not get it
I'll admit, in hindsight it's very clear what this is trying to tell me, but for whatever reason I still did not understand it and I just used a : everywhere.
From the docs
If you run :h <cmd> you will see a lot of reasons why you should do it, from
performance, to hygene, to ergonomics. You will also see another clear
statement about how to use <cmd>.
E5520 <Cmd> commands must terminate, that is, they must be followed by <CR> in the {rhs} of the mapping definition. Command-line mode is never entered.
When to map with a :
You still need to map your remaps with a : if you do not close it with a
<cr>. This might be something like prefilling a command with a search term.
nnoremap <leader><leader>f :s/search/
Otherwise use
If you can close the <cmd> with a <cr> the command do so. Your map will
automatically be silent, more ergonomic, performant, and all that good stuff.
nnoremap <leader><leader>f <cmd>s/search/Search/g<cr>