Pages has stopped responding - iCloud

I've just bought 2TB of iCloud storage for one purpose, and that purpose is not working!!

Has anyone else ever received the following message when opening Pages from the iCloud.com website:

Pages has stopped responding.

I've expanded on the details of this error, and it mentions the following:

ERROR TITLE

undefined is not an object (evaluating 'n.length')

ERROR TYPE

UNCAUGHT_EXCEPTION

ERROR CONTEXT

https://www.icloud.com/applications/bight/4B112/en-us/main.js:11:3628614

[native code]

https://www.icloud.com/applications/bight/4B112/en-us/main.js:11:3628825

i@https://www.icloud.com/applications/bight/4B112/en-us/main.js:11:418167

r@https://www.icloud.com/applications/bight/4B112/en-us/main.js:11:694705

promiseReactionJob@[native code]

Is anyone able to look at this and help me access Pages because I really need to use this app... hence why I paid for additional storage!! I've added a screenshot for context.

Thanks