Hi can't save files in illustrator. Can export. 'An unknown error is detected...

[Dean24805693ny14]

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Anybody know what to do? 

Have tried opening fresh files and copy and pasting all the work across. This worked but then after a while I wouldn't be able to save, and finally this method to dodge the problem has stopped working. I can't save any files. 

[Dean24805693ny14 · Accepted solution]

Had too many programs open. Works now.