Plugin no longer works, getting error in console

[mitchar]

Uncaught TypeError: Cannot read property 'querySelector' of null at GitLabTree.obtainMetadata_latest (inject.js:109) at GitLabTree.obtainMetadata (inject.js:92) at new GitLabTree (inject.js:34) at checkSiteChange (inject.js:479) at inject.js:482 GitLabTree.obtainMetadata_latest @ inject.js:109 GitLabTree.obtainMetadata @ inject.js:92 GitLabTree @ inject.js:34 checkSiteChange @ inject.js:479 (anonymous) @ inject.js:482 setInterval (async) (anonymous) @ inject.js:482

[SathishkumarThangavel]

Getting below error as response {"error":"API V3 is no longer supported. Use API V4 instead."}