/users/[userId]/[project]/[projectId]/page.tsx
export async function generateStaticParams() {
  return [
    { userId: '1', project: '1', projectId: '1' },
    { userId: '2', project: '2', projectId: '2' }
  ]
}

//users/[userId]/page.tsx 
export async function generateStaticParams() {
  return [
    { userId: '1' },
    { userId: '2' }
  ]
}

 return [{ userId: "blabla",
         project:"vercel"
       },{...})

Server Error
Error: Page "/users/[userId]/[project]/page" is missing param "/users/2/1" in "generateStaticParams()", which is required with "output: export" config.

This error happened while generating the page. Any console logs will be displayed in the terminal window.

 return [{project:"vercel"
       },{...})

  const users = []
  for(let i=0; i<10;i++){
   racks.push({id:i.toString()})
  }
      
       return users.map((user) => ({
         userId: user.id,
        project:user.id
       }))

export const generateStaticParams = async()=>{
   
   const users = []
   for(let i=0; i<10;i++){
    users.push({id:i.toString()})
   }
       
        return users.map((user) => ({
          userId: user.id,
        }))

      
}

export const generateStaticParams = async()=>{
   
   const users = []
   for(let i=0; i<10;i++){
    users.push({id:i.toString()})
   }
       
        return users.map((user) => ({
          //userId: user.id,
          project:user.id
        }))

      
}

  return users.map((user) => ({
          userId: user.id,
          project:user.id
        }))

  return users.map((user) => ({
          userId: user.id,
          project:user.id
        }))

<Link href={'/users/${userId}'}>{username}</Link>

export const dynamicParams = false;

staticPaths = pathsResult.staticPaths;
fallbackMode = pathsResult.fallbackMode;
hasFallback = typeof fallbackMode !== "undefined";
if (this.nextConfig.output === "export") {
  const page = components.page;
  if (fallbackMode !== "static") {
    throw new Error(`Page "${page}" is missing exported function "generateStaticParams()", which is required with "output: export" config.`);
  }
  const resolvedWithoutSlash = (0, _removetrailingslash.removeTrailingSlash)(resolvedUrlPathname);
  if (!(staticPaths == null ? void 0 : staticPaths.includes(resolvedWithoutSlash))) {
                    throw new Error(`Page "${page}" is missing param "${resolvedWithoutSlash}" in "generateStaticParams()", which is required with "output: export" config.`);
  }
}