Add client & Enter Payment Internal server error

I install the last version of IP v1.5.4 and I have another install with IP working fine, the installation went good and no problems I create the user and pass and login. It enters to the dashboard and everything works fine except the Add Client & the Enter Payment, it gives me the Internal Server Error:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at webmaster@mydomain.com to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

I have the same issue with v1.5.4. Upgrade from v1.5.3 went without error and most of the functions on the client end seem to be working. However, I receive the above Internal Server Error whenever attempting to add or edit clients, users, payments, invoices, etc. I’m sad because v1.5.4 finally fixed some other issues I was having, but now I can’t do any of the more basic admin functions. Any help would be appreciated!

P.S. There was nothing listed in the debug log except for something along the lines of “Internal Error”.

UPDATE: It is possible that yesterday I had the log disabled when testing this. I ran another test this morning and there is much more in the log, but still nothing that seems to indicate any error at all, let alone what the problem might be. Here is a sample of my log from this morning when I tried to edit a user account:

DEBUG - 2017-09-11 07:56:14 --> UTF-8 Support Enabled
DEBUG - 2017-09-11 07:56:14 --> Global POST, GET and COOKIE data sanitized
DEBUG - 2017-09-11 07:56:14 --> Users MX_Controller Initialized
DEBUG - 2017-09-11 07:56:14 --> Config file loaded: /home/studiocline/BILLING/application/config/invoice_plane.php
DEBUG - 2017-09-11 07:56:14 --> Encryption: Auto-configured driver ‘openssl’.
DEBUG - 2017-09-11 07:56:14 --> File loaded: /home/studiocline/BILLING/application/modules/settings/models/Mdl_settings.php
DEBUG - 2017-09-11 07:56:14 --> File loaded: /home/studiocline/BILLING/application/controllers/…/modules/layout/controllers/Layout.php
DEBUG - 2017-09-11 07:56:14 --> Layout MX_Controller Initialized
DEBUG - 2017-09-11 07:56:14 --> File loaded: /home/studiocline/BILLING/application/modules/users/models/Mdl_users.php
DEBUG - 2017-09-11 07:56:14 --> File loaded: /home/studiocline/BILLING/application/modules/custom_fields/models/Mdl_user_custom.php
DEBUG - 2017-09-11 07:56:14 --> File loaded: /home/studiocline/BILLING/application/modules/user_clients/models/Mdl_user_clients.php
DEBUG - 2017-09-11 07:56:14 --> File loaded: /home/studiocline/BILLING/application/modules/clients/models/Mdl_clients.php

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