cannot edit email!

When I try to edit the email. Nothing showing up and the following error messages found by Chrome:

Uncaught TypeError: Cannot read property ‘call’ of undefined
at __webpack_require__ (vendor.80f6e67f.js:51)
at Object.505 (newsletter_editor.8195eca1.js:sourcemap:27611)
at __webpack_require__ (vendor.80f6e67f.js:51)
at Object.0 (newsletter_editor.8195eca1.js:sourcemap:133)
at __webpack_require__ (vendor.80f6e67f.js:51)
at webpackJsonpCallback (vendor.80f6e67f.js:22)
at newsletter_editor.8195eca1.js:sourcemap:1
__webpack_require__ @ vendor.80f6e67f.js:51
505 @ newsletter_editor.8195eca1.js:sourcemap:27611
__webpack_require__ @ vendor.80f6e67f.js:51
0 @ newsletter_editor.8195eca1.js:sourcemap:133
__webpack_require__ @ vendor.80f6e67f.js:51
webpackJsonpCallback @ vendor.80f6e67f.js:22
(anonymous) @ newsletter_editor.8195eca1.js:sourcemap:1
admin.php?page=mailpoet-newsletter-editor&id=1:2864 Uncaught ReferenceError: EditorApplication is not defined
at Object.<anonymous> (admin.php?page=mailpoet-newsletter-editor&id=1:2864)
at i (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2)
at Object.<anonymous> (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2)
at i (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2)
at y (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:4)
at XMLHttpRequest.c (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:4)
(anonymous) @ admin.php?page=mailpoet-newsletter-editor&id=1:2864
i @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2
fireWith @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2
(anonymous) @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2
i @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2
fireWith @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:2
y @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:4
c @ load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,plupload&ver=4.7.5:4