Can't get on server

This is not Emma writing this. I'm her friend who is having a problem with the sever and can't get on to get the key to make and account to say I CANT GET ON. I've contacted the email that was given for if this problem arises, but I have yet to get a reply. I wouldn't be upset if I hadn't bought ranks on this server, and put a great amount of time into building.

Now the problem is I can't get on it says "internal exception". Now let me clarify a few things.

1. I can get onto other servers.
2. I HAVE changed the IP (Please don't say you just need to change the IP, because even when I say that I have someone always mentions that "oh you have to change it.").
3. This isn't only happening to me it's also happening to my friend. We aren't on the same network so it's not that(we live states away.).
4. Yes I'm using mods. Though I used mods on this server and it used to work. And yes I took the the mods off to see if that was the problem.

Okay now that that's out of the way do you think you can figure it out? I read on other forms about servers having this problem, and what needs to happen is that something needs to be reset due to a corrupted chunk. I just really want to be able to play on this server given that I have invested money into it. Please don't tell me my I have to change the IP or direct connect because trust me I've tried and it hasn't worked.

Thanks,
Lilla

 

I posted one in community and one in staff because I don't know who can help me. I didn't do it to spam I didn't because I have no clue if someone my have dealt with this and now the answer in the community or if a staff member knows how to fix it.
Just trying to get the problem resolved so I can stop posting in form in the first place.

 

I posted the image on my tumblr then uploaded it her, because I asked for help on there too.

 

Cause I don't want people to think it's fake just because I used a link from my tumblr.