Not starting after changing server settings

I even tried to install the program again. Still the same error. …could’nt start for some reason in your system…

I tried to change server settings and try to use remote control from my iphone. Then this happened.

How could I solve this problem? Please help.

Could you attach your debug log here? https://quelea-projection.github.io/docs/Debug_log.html

That might help us work out what’s going on.