Deleting a very large txt file from flash : Cisco

A few years ago Cisco enabled event manager to record data on an ASR to a txt file which is stored in flash.

I've just noticed that the event manager is still running and so the txt file is over 2Gb in size now and stored in flash :/

I've tried to delete it from the bootflash but get the error 'error deleting eem-log.txt (Value too large to be stored in data type)'

I'd like this space back and I think if I reboot it the file will still have the same issue with being deleted?

Any tips on how I can delete this file?

Thanks