Warning: simplexml_load_file failed to open stream: Permission denied

On the local machine, everything works fine, but the upload to the hosting has errors:

Warning: simplexml_load_file() [function.simplexml-load-file]: failed to open stream: Permission denied in /fori.php on line 6
Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity "" in /fori.php on line 6

The code, in addition to all the functions there (I tried to remove them, the same errors):

simplexml_load_file('');

As far as I understand, I do not have enough rights, but how can I increase my rights if this is the case?) I’ve been fiddling around for the 2nd day and, as usual, I’m the only one in this situation, so I didn’t find anything I needed in the search engines. ..

Added.

Here’s the way

server:8081/interfaceX1.php?
query=X1NFTF9fcGFja29kLF9zdXJuYW1lLF9uYW1lLF9wYXJuYW1lLF9iaXJ
0aGRheSxfYXJlYV9fSVpfX2tsaWVudHNfd2hlcmVfcG9saXNudW09JzE0MjY4MjInX2FuZF9hcm
VhI5456J19hbm34XJlYV9pc19ub3RfbnVs34gfYXJlYSE9JzI4J19hbmRfYXJlYSE9JzI5Jw==
&sign=8214b0eb0fff3698d39a6b4765fd528d


Answer 1, authority 100%

Give read and write access to the file and folder you are working with.


Answer 2, authority 100%

Access rights on a remote server are set on folders with files via ftp access using Total Commander.