The file cannot download ?

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I upload some files through the file manager,when I click on the  download button, it makes the error "mxui.js:51 TypeError: Cannot read property 'getElementsByTagName' of undefined", how should I do?  The file entity's genelization is the file.document od System.
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2 answers
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return (t = e.getElementsByTagName("textarea")[0]) && (n = JSON.parse(t.value)).type && "exception" === n.type && ((r = new i(n.description))._type = "exception"),

at Line 7553,Column 11 

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Because your app has more than 1 instance, when the instance changes, the data in /data/files will be cleaned, so you should use S3 object storage service(Amazon) or other Storage service

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