Gutenberg Issue with editoring old post

Good Afternoon,

I installed Gutenberg on my test site. I then tried to edit an existing post. I get this message:

The editor has encountered an unexpected error.

If I copy the error this is what I get:

_createModes/<@https://dev.navalwargaming.com/wp-includes/js/media-views.min.js?ver=4.9.8:1:24298
Bt@https://dev.navalwargaming.com/wp-content/plugins/events-gutenberg/plugins/common/src/resources/js/hoc.js?ver=0.2.7-alpha:9:5240
Vo@https://dev.navalwargaming.com/wp-content/plugins/events-gutenberg/plugins/common/src/resources/js/hoc.js?ver=0.2.7-alpha:9:40278
_createModes@https://dev.navalwargaming.com/wp-includes/js/media-views.min.js?ver=4.9.8:1:24261
initialize@https://dev.navalwargaming.com/wp-includes/js/media-views.min.js?ver=4.9.8:1:23667
initialize@https://dev.navalwargaming.com/wp-includes/js/media-views.min.js?ver=4.9.8:1:25287
initialize@https://dev.navalwargaming.com/wp-includes/js/media-views.min.js?ver=4.9.8:1:28159
e.View@https://dev.navalwargaming.com/wp-admin/load-scripts.php?c=1&load%5B%5D=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.8:17:14728
constructor@https://dev.navalwargaming.com/wp-includes/js/wp-backbone.min.js?ver=4.9.8:1:2602
constructor@https://dev.navalwargaming.com/wp-includes/js/media-views.min.js?ver=4.9.8:1:23102
n@https://dev.navalwargaming.com/wp-admin/load-scripts.php?c=1&load%5B%5D=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.8:17:22929
n@https://dev.navalwargaming.com/wp-admin/load-scripts.php?c=1&load%5B%5D=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.8:17:22929
n@https://dev.navalwargaming.com/wp-admin/load-scripts.php?c=1&load%5B%5D=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.8:17:22929
20/wp.media@https://dev.navalwargaming.com/wp-includes/js/media-models.min.js?ver=4.9.8:1:666
t@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/build/edit-post/index.js?ver=1536849244:12:4873
yh@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:97:111
lg@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:120:88
mg@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:120:386
gc@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:127:202
vb@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:126:230
ub@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:126:65
wg@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:137:182
Ze@https://dev.navalwargaming.com/wp-content/plugins/gutenberg/vendor/react-dom.min.82e21c65.js:41:24

I tried the attempt recovery with no luck.

The only way I can edit a post is to turn off Gutenburg. I’m using TwentyTwelve with a childtheme, bbpress, buddypress. I’m not not sure if this is a Gutenburg issue or an issue with my site.

Patricia