Links button don't work in custom created module

Hello! I created test module called “Kotik” and created 2 doctypes there. I linked 1 doctype to another and tryed to see linked documets, but I get an
“Module Kotik not found — The resource you are looking for is not available” error. I created another module and tried there but got same results. Module “Kotik” is created and active.
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How can I make that “Links” button work?

Thank you in advance!