WHMCS error when logging in to client area.

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InMotionFans
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I am getting the following error when logging in as a customer to WHMCS. Any thoughts how I can fix it?

Fatal error: Uncaught exception 'RuntimeException' with message 'Calculated algorithm "unknown" is not supported' in /home/OOOOOOOO/public_html/OOOOOOOO/includes/classes/WHMCS/Security/Hash/Password.php:0 Stack trace: #0 /home/OOOOOOOO/public_html/OOOOOOOO/includes/classes/WHMCS/Authentication/Client.php(0): WHMCS\Security\Hash\Password->verify('OOOOOOOO', 'OOOOOOOO') #1 /home/OOOOOOOO/public_html/OOOOOOOO/dologin.php(0): WHMCS\Authentication\Client->verifyFirstFactor() #2 {main} Next exception 'RuntimeException' with message 'Calculated algorithm "unknown" is not supported' in /home/OOOOOOOO/public_html/OOOOOOOO/includes/classes/WHMCS/Terminus.php:0 Stack trace: #0 [internal function]: WHMCS\Terminus->whmcsExceptionHandler(Object(RuntimeException)) #1 {main} thrown in /home/OOOOOOOO/public_html/OOOOOOOO/includes/classes/WHMCS/Terminus.php on line 0
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IMH Support Agent 5
Hello, Thank you for contacting us about this WHMCS error. This is certainly not the expected error, and we cannot even find WHMCS documentation that mentions this error. It's possible there is a deeper configuration issue that needs to be addressed. This would require account verification to dig further. I suggest contacting our Live Support department with replication steps and the necessary account credentials. Best, Christopher M.