Server exception not caught is lock file is not writable

Mon, 27 Jan 2020 22:26:29 GMT solid:get GET -- Error: undefined EACCES: permission denied, mkdir '/Library/WebServer/Documents/profile/card$.ttl.lock'
(node:1964) UnhandledPromiseRejectionWarning: TypeError: releaseLock is not a function
    at Promise (/devel/github.com/solid/node-solid-server/lib/lock.js:25:13)
    at <anonymous>
(node:1964) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 105274)
Mon, 27 Jan 2020 22:26:30 GMT solid:get GET -- Error: undefined EACCES: permission denied, mkdir '/Library/WebServer/Documents/timbl/Public/Archive/linkeddata/chat/2019/08/23/chat.ttl.lock'
(node:1964) UnhandledPromiseRejectionWarning: TypeError: releaseLock is not a function
    at Promise (/devel/github.com/solid/node-solid-server/lib/lock.js:25:13)
    at <anonymous>
(node:1964) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 105275)

從 lib/lock.js 第 25 行附近開始，在無法建立鎖定檔案時重現 EACCES 錯誤。追蹤遭拒絕的操作如何到達 GET 處理常式，並確認伺服器在此情況下不再發出未處理的 promise rejection。