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SimpleSAML\Error\Error: UNHANDLEDEXCEPTION

Backtrace:
1 www/_include.php:17 (SimpleSAML_exception_handler)
0 [builtin] (N/A)
Caused by: Exception: No aggregated statistics files found in [/var/log/simplesamlphp/stats/]
Backtrace:
5 modules/statistics/lib/Ruleset.php:65 (SimpleSAML\Module\statistics\Ruleset::init)
4 modules/statistics/lib/Ruleset.php:34 (SimpleSAML\Module\statistics\Ruleset::__construct)
3 modules/statistics/lib/StatisticsController.php:108 (SimpleSAML\Module\statistics\StatisticsController::main)
2 modules/statistics/www/showstats.php:14 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)