如何解决AGE Viewer中的“Metadata Load Error”问题？

问题表现 #

• 执行npm start启动AGE Viewer后，终端持续输出Error: Not connected错误，完整错误栈如下：

Error: Not connected
    at _callee4$ (/home/hallixon/age-viewer/backend/src/controllers/databaseController.js:64:19)
    at tryCatch (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:44:17)
    at Generator.<anonymous> (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:125:22)
    at Generator.next (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:69:21)
    at asyncGeneratorStep (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:24)
    at _next (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:22:9)
    at /home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:27:7
    at new Promise (<anonymous>)
    at apply (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:19:12)
    at getMetadata (/home/hallixon/age-viewer/backend/src/controllers/databaseController.js:66:6)
info: ::ffff:127.0.0.1 - - [05/Aug/2023:04:50:51 +0000] "POST /api/v1/db/meta HTTP/1.1" 500 51
 {"timestamp":"2023-08-05 05:50:51"}
Error: Not connected
    at _callee3$ (/home/hallixon/age-viewer/backend/src/controllers/databaseController.js:54:19)
    at tryCatch (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:44:17)
    at Generator.<anonymous> (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:125:22)
    at Generator.next (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/regeneratorRuntime.js:69:21)
    at asyncGeneratorStep (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:24)
    at _next (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:22:9)
    at /home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:27:7
    at new Promise (<anonymous>)
    at apply (/home/hallixon/age-viewer/backend/node_modules/@babel/runtime/helpers/asyncToGenerator.js:19:12)
    at getStatus (/home/hallixon/age-viewer/backend/src/controllers/databaseController.js:56:6)
info: ::ffff:127.0.0.1 - - [05/Aug/2023:04:50:51 +0000] "GET /api/v1/db HTTP/1.1" 500 51
 {"timestamp":"2023-08-05 05:50:51"}
info: ::ffff:127.0.0.1 - - [05/Aug/2023:04:50:51 +0000] "GET /api/v1/miscellaneous HTTP/1.1" 304 -
 {"timestamp":"2023-08-05 05:50:51"}

• AGE Viewer可正常在3000端口访问，但尝试连接数据库时，界面弹出Metadata Load Error错误：
  
• 数据库内已有的图、节点、边信息完全无法加载，点击"Current Graph"下拉菜单无任何选项

预期结果 #

能正常连接数据库，加载并显示库中已有的图、节点、边信息，无任何报错

内容的提问来源于stack exchange，提问作者Emmanuel Allison