Error 500 after upgrading to 2019.1.6 
Author: Arie V.
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After updating to version 2019.1.6 the procedure for admission of members to the secret pages did not work. see www.rijnstreekkoor.nl /leden
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Somebody with more knowledge than I will hopefully step in if my guess is wrong, but what version of php is running on your host (log in to the control panel to check, if it is a linux host www.rijnstreekkoor.nl/cpanel), I recently realised I was running 5.4.? but required 5.6.? Most people seem to recommend 7.1.?