'(node:1156) UnhandledPromiseRejectionWarning: Error: Both xsel and fallback failed

i am trying to deploy this:https://github.com/tks18/gindex-v4 but i am getting this error. I am using Goormide. full output:

(node:1156) UnhandledPromiseRejectionWarning: Error: Both xsel and fallback failed
    at makeError (/usr/lib/node_modules/gindex-cli-tool/node_modules/clipboardy/lib/linux.js:16:11)
    at xselWithFallbackSync (/usr/lib/node_modules/gindex-cli-tool/node_modules/clipboardy/lib/linux.js:43:10)
    at Object.copySync (/usr/lib/node_modules/gindex-cli-tool/node_modules/clipboardy/lib/linux.js:53:3)
    at Object.exports.writeSync.text [as writeSync] (/usr/lib/node_modules/gindex-cli-tool/node_modules/clipboardy/index.js:45:14)
    at spinner (/usr/lib/node_modules/gindex-cli-tool/commands/deploy/frontend/index.js:18:16)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:1156) 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: 1)
(node:1156) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
node.js


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