This happens only when I run my application as linux service. Executing my node app normally by "node main.js" works good.

Error Thrown at :

/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:43
throw makeError(xselError, fallbackError);
^

Full Error Stack :

            Error: Both xsel and fallback failed
                at makeError (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:16:11)
                at xselWithFallbackSync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:43:10)
                at Object.copySync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:53:3)
                at Object.exports.writeSync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/index.js:45:14)
                at Watcher.onChangeDetection (/home/mani/Desktop/mani/tools/screenshot-easy/main.js:85:16)
                at Watcher.emit (events.js:310:20)
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:305:19
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:39:7
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:303:7
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:109:10 {
            xselError: Error: Command failed: xsel --clipboard --input
            xsel: Can't open display: (null)
            : Inappropriate ioctl for device
            
            
                at makeError (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/execa/index.js:174:9)
                at Function.module.exports.sync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/execa/index.js:338:15)
                at xselWithFallbackSync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:38:16)
                at Object.copySync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:53:3)
                at Object.exports.writeSync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/index.js:45:14)
                at Watcher.onChangeDetection (/home/mani/Desktop/mani/tools/screenshot-easy/main.js:85:16)
                at Watcher.emit (events.js:310:20)
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:305:19
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:39:7
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:303:7 {
                code: 1,
                stdout: '',
                stderr: "xsel: Can't open display: (null)\n: Inappropriate ioctl for device\n",
                failed: true,
                signal: null,
                cmd: 'xsel --clipboard --input',
                timedOut: false
            },
            fallbackError: Error: Command failed: /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/fallbacks/linux/xsel --clipboard --input
            /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/fallbacks/linux/xsel: Can't open display: (null)
            : Inappropriate ioctl for device
            
            
                at makeError (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/execa/index.js:174:9)
                at Function.module.exports.sync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/execa/index.js:338:15)
                at xselWithFallbackSync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:41:17)
                at Object.copySync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/lib/linux.js:53:3)
                at Object.exports.writeSync (/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/index.js:45:14)
                at Watcher.onChangeDetection (/home/mani/Desktop/mani/tools/screenshot-easy/main.js:85:16)
                at Watcher.emit (events.js:310:20)
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:305:19
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:39:7
                at /home/mani/Desktop/mani/tools/screenshot-easy/node_modules/node-watch/lib/watch.js:303:7 {
                code: 1,
                stdout: '',
                stderr: "/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/fallbacks/linux/xsel: Can't open display: (null)\n" +
                ': Inappropriate ioctl for device\n',
                failed: true,
                signal: null,
                cmd: '/home/mani/Desktop/mani/tools/screenshot-easy/node_modules/clipboardy/fallbacks/linux/xsel --clipboard --input',
                timedOut: false
            }
            }