Error [ERR_MODULE_NOT_FOUND

[SenpaiX1]

when I try to start it, it says

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'fastify' imported from /home/SenpaiX1/SUS/app.js at _0x545e32 (https://sus-g3ja.w-corp-staticblitz.com/blitz.96435430.js:31:22523) at NodeError (node:internal/errors:104:4347) at packageResolve (node:internal/modules/esm/resolve:161:9233) at moduleResolve (node:internal/modules/esm/resolve:161:9926) at defaultResolve (node:internal/modules/esm/resolve:161:12052) at defaultResolve (node:internal/modules/esm/loader:157:5815) at #n (node:internal/modules/esm/loader:157:5397) at resolve (node:internal/modules/esm/loader:157:5293) at getModuleJobForImport (node:internal/modules/esm/loader:157:1852) at _link (node:internal/modules/esm/module_job:158:1632) { code: 'ERR_MODULE_NOT_FOUND' }

[EnchantedDonutStudioz]

run pnpm i