Object has no method 'execSync' about asciicast2gif HOT 2 CLOSED

/usr/lib/node_modules/asciicast2gif/main.js:697
):b.call(null,a)}catch(c){if(c instanceof Object)throw b=c,Yo(a[6]),b;throw c;
                                                                    ^
TypeError: Object #<Object> has no method 'execSync'
    at Dp (/usr/lib/node_modules/asciicast2gif/main.js:708:246)
    at /usr/lib/node_modules/asciicast2gif/main.js:713:178
    at Function.b (/usr/lib/node_modules/asciicast2gif/main.js:709:287)
    at ep (/usr/lib/node_modules/asciicast2gif/main.js:697:48)
    at /usr/lib/node_modules/asciicast2gif/main.js:697:193
    at /usr/lib/node_modules/asciicast2gif/main.js:689:264
    at Object.Po [as _onImmediate] (/usr/lib/node_modules/asciicast2gif/main.js:685:331)
    at processImmediate [as _immediateCallback] (timers.js:363:15)