There is an error. core/dispatch.php line 37 PHP unserialized (1 reply)

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Notice: Array to string conversion in /<HOSTING_ROOT_STRING>/core/dispatch.php on line 37 

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [/<HOSTING_ROOT_STRING>/core/dispatch.php:37]
#1 require_once(...) called at [/<HOSTING_ROOT_STRING>/index.php:47]

Array

/index.php?module=API&method=API.get&format=PHP&idSite=18&period=day&date=2014-05-02,2014-05-10&expanded=1&token_auth=<AUTH_TOKEN_STRING>&serialize=0