Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://matrix.org/_matrix/client/r0/sync?filter=3&timeout=0&_cacheBuster=1571160686711. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

/sync error Error: CORS request rejected: https://matrix.org/_matrix/client/r0/sync?filter=3&timeout=0&_cacheBuster=1571160686711 rageshake.js:107:31
    r rageshake.js:107
    _onSyncError sync.js:1170
    e sync.js:977
    E runtime.js:62
    _invoke runtime.js:296
    t runtime.js:114
    c bluebird.js:5290
    _promiseRejected bluebird.js:2157
    _settlePromise bluebird.js:3366
    _rejectPromises bluebird.js:3469
    _settlePromises bluebird.js:3481
    p bluebird.js:190
    f bluebird.js:183
    _drainQueues bluebird.js:199
    drainQueues bluebird.js:69
Error: "CORS request rejected: https://matrix.org/_matrix/client/r0/sync?filter=3&timeout=0&_cacheBuster=1571160686711"
    c index.js:259
    onreadystatechange index.js:242
rageshake.js:107:31
    r rageshake.js:107
    _onSyncError sync.js:1172
    e sync.js:977
    E runtime.js:62
    _invoke runtime.js:296
    t runtime.js:114
    c bluebird.js:5290
    _promiseRejected bluebird.js:2157
    _settlePromise bluebird.js:3366
    _rejectPromises bluebird.js:3469
    _settlePromises bluebird.js:3481
    p bluebird.js:190
    f bluebird.js:183
    _drainQueues bluebird.js:199
    drainQueues bluebird.js:69
Number of consecutive failed sync requests: 7 rageshake.js:107:31
Starting keep-alive rageshake.js:107:31
MatrixClient sync state => ERROR