Error: Could not resolve './tokens' from src/coem.grammar

[kayserifserif]

Ran npm run build, got:

> @codemirror/lang-coem@0.1.0 build
> lezer-generator src/coem.grammar -o src/parser && rollup -c

Wrote src/parser.js and src/parser.terms.js

src/index.ts → dist/lang-coem.js...
[!] Error: Could not resolve './tokens' from src/coem.grammar
Error: Could not resolve './tokens' from src/coem.grammar
    at error (/Users/katherine/Downloads/lang-coem/node_modules/rollup/dist/shared/rollup.js:198:30)
    at ModuleLoader.handleResolveId (/Users/katherine/Downloads/lang-coem/node_modules/rollup/dist/shared/rollup.js:22464:24)
    at /Users/katherine/Downloads/lang-coem/node_modules/rollup/dist/shared/rollup.js:22427:26