Error uploading LOGO

I find the following problem, caused by trying to upload a file that Omeka interpreted as unknown to LOGO first page.
From what I see, the blockade has been carried out for security reasons.
Currently, I can not access my site located at www.circuitos.
I enclose the error messages.

[25-Jan-2019 00:57:49 UTC] PHP Warning: shell_exec () has been disabled for security reasons in /home/umunter/ /FileCommand.php on line 23
[25-Jan-2019 00:57:49 UTC] PHP Warning: Invalid argument supplied for foreach () in /home/umunter/ .php on line 22

The errors you posted shouldn’t be related to anything that would mess up the front page, I think.

Thank you. Finally, the error was in the htaccess.

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