Unable to upload: server error

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I uploaded many files via drag & drop, everything was working just fine but now it does not allow me to upload anymore via drag & drop (unable to upload: server error)
I've tried to upload different files via drag & drop and nothing works anymore.
- It was working fine with Google Chrome Version 59.0.3071.115 (Official Build) (64-bit), but now I get "Unable to upload: server error"
- I tried IE 11 but I get Error: Object doesn't support property or method 'indexOf'

Please help.

I didn't find the right solution from the Internet.

References https://www.dropboxforum.com/t5/ ... r-error/td-p/230613

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