You have posted an admin account, which is of course silly and not what I have asked for. I have changed the password of that account to make sure nobody is abusing that. You should have read carefully what you need to do:
Asking for support on upload issues
When asking for support on the coppermine forum, post a link to your site and a test user account (the test user mustn't be in the admin group!) with upload privileges, with the above mentioned settings in place - this way, supporters can see the error messages as well. Do not post debug_output unless requested. If you want fast results, you should disable admin approval for the group the test user is in, so supporters can tell instantly what is wrong without needing to double-check.
When people have issues with uploading and decide to post their question on the Coppermine support board, they usually are told to read this upload troubleshooting section. Many of them fail to do so properly, which results in frustration both for users as well as supporters. To make this absolutely clear: the above mentioned steps are absolutely mandatory, no matter what skill level you have, no matter what upload method you have troubles with. Failing to do exactly as suggested will result in your request for help being ignored. Yes, this applies to you. We mean it!
Additionally, you haven't set the number of file and URI upload fields as you should have, nor did you enable debug_mode, so no: you didn't understand at all or you have been too lazy to read. I'm not ready to support your laziness. Do as I suggested. Setting the "Maximum allowed file size" to 400000000000000000 KB is just plain silly - that's 400,000,000 TB. The same is the case for your setting for "Max width or height for uploaded pictures/videos (pixels) " that you have set to the same value. Use values that make sense. I have changed that for you.
Turning watermarking temporarily off the same thing happens - I get the template error, so I temporarily
set your gallery to the classic theme, but the template error remains, so my guess is that you have over-modified a file or a file is broken. I suggest to perform an update to replace all files with fresh copies.
I did more than you could expect from free support, as you have misbehaved in nearly every aspect one could think of. I suggest you make your homeworks first before asking questions again. I'm out of this thread.