
Are these critical errors? Can they be fixed?

Are these critical errors? Can they be fixed?
These warnings and notices are not critical. The three you show here, for example, are stylistic inconsistency in coding, without a negative practical effect. Many of these are remediated in 3.1.2.
Now I am completely calm. Got experience with OJS. I will be glad to help you all. Thank you all so much. 
Dear @eiavrn,
I have the same problem after upgrading to OJS 3.1.2. When selecting the register menu, “HTTP ERROR 500” will appear. Can you help me?
Regards,
Aprik
Hi @Aprik,
Check your PHP error log for details.
Regards,
Alec Smecher
Public Knowledge Project Team
Hi @asmecher,
Thanks in advance
Sorry, I am late. I have managed to fix this problem by disable the plugin or upgrading it.
Regards,
Aprik
It solved my problem…Thank you sooooo much ctgraham 
I just reinstall the OJS new version version 3.3.0.3 Registration page not opening.
Actual link is Journal of Educational Research and Social Sciences Review (JERSSR)
But when a new user want to register it self on following link nothing appears…
https://ojs.jerssr.org.pk/index.php/jerssr/user/register
Kindly check the issue and let me know if you have any solution.
Regards
Hi @ilyaskhalil,
I see you’ve already posted this on another topic: Registration page not opening in version 3.3.0.3 - #2 by ilyaskhalil
Please don’t post the same content in several places; it clutters the forum. Someone will respond on that thread.
Regards,
Alec Smecher
Public Knowledge Project Team