Errors after update to latest version

@Gal_Rotem wrote:

hi,
yesterday i updated my piwik from 2.15 to latest version (3.2.0) and also update from php 5.3.8 to 7.0.3.
MySQL version: 5.6.22
running on windows server 2008, IIS 7.5

after the update nothing is working, i get errors
"oops… there was a problem during request. Maybe the server had a temporary issue, or maybe you requested a report with too much data. Please try again. if this error occurs repeatedly please contact your piwik administrator for assistance"

similar to https://github.com/piwik/piwik/issues/12051 but with almost all the widgets.

any idea how to fix this?
maybe php/iis configuration

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