Unable to see the submissions/Submissions link not working

Hello, I recently installed OJS 3.1.2.4, the link is as under:
https://pkps.org/ojs/index.php/jpap
The journal is opening, everything is working fine except
a. I’m unable to see the submissions and
b. I’m unable to login to my admin dashboard
I checked with the PHP log and noted the following errors:
[24-Dec-2019 13:04:09 UTC] PHP Strict Standards: Declaration of PKPSubmissionSubmitStep1Form::execute() should be compatible wit
h Form::execute(…$functionArgs) in /home/pkpsorg/public_html/ojs/lib/pkp/classes/submission/form/PKPSubmissionSubmitStep1Form.i
nc.php on line 18
[24-Dec-2019 13:04:09 UTC] PHP Strict Standards: Declaration of SubmissionSubmitStep1Form::fetch() should be compatible with PKP
SubmissionSubmitStep1Form::fetch($request, $template = NULL, $display = false) in /home/pkpsorg/public_html/ojs/classes/submissio
n/form/SubmissionSubmitStep1Form.inc.php on line 18
[24-Dec-2019 13:04:09 UTC] PHP Strict Standards: Only variables should be passed by reference in /home/pkpsorg/public_html/ojs/c
ache/t_compile/cfac7d723fa83a8468f3fec3577c93a53cdab919^d4a7db69d40565910b7236a1c96ad325268f4ab6_0.app.submissionformstep1.tpl.ph

p on line 33

I am not sure, how to fix these errors,
Urgent help is desired.

Ahmad Bilal