rbewley

updated PHP interpreter and reinstalled hummingbird plugin. All working fine.
thanks for the advice

I have managed to get back into my site by disabling the hummingbird plugin. I reached out to VaultPress Support who were really helpful- they proposed:

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That said, if this is the case, then the next thing I’d do is disable the Hummingbird plugin. You can do this by renaming it’s folder in
/wp-content/plugins/hummingbird-performance to something like “hummingbird-OLD”, or you can completely delete it.-

You can do the above either via FTP or your web host’s control panel. If you’re unsure about how to do either, your host’s support should be able to help.
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I did this and it worked. I then tried to reinstall teh Hummingbird plugin- exactly the same issue returned. I can onyl think that there has been a recent update. I have removed Hummingbird for now in the hope that the error will be resolved in due course.