Here is the php error log. However from what I can see, all the errors relate to my previous theme, flexsqueeze, which I just replaced with the Generate Press theme a few days ago.
[02-Mar-2018 13:24:28 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:24:31 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:24:37 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:27:50 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:29:07 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:29:33 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:29:44 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:30:01 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:31:06 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:32:24 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:32:42 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214
[02-Mar-2018 13:33:08 UTC] PHP Warning: Declaration of flex_walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /home/shamak/public_html/wp-content/themes/flexsqueeze2/functions.php on line 214