Google webmaster "soft 404" errors

[msouefi]

hello
i am using v Bulletin Version 5.2.5 and a soft error keeps appearing on my google webmaster tool as in fig bellow:

https://vborg.vbsupport.ru/external/2016/12/6.png

showing that the url:
http://aqarspot.com/core is linking from the following pages in my website:

http://aqarspot.com/forum/saudi-properties/central/qassim/chalet/762-شاليه-جديد-للبيع-مخطط-اليحي-شمال-بريده
http://aqarspot.com/forum/saudi-properties/central/alriyadh/land-sale
http://aqarspot.com/forum/saudi-properties/central/alriyadh/apartments-rent
http://aqarspot.com/
http://aqarspot.com/forum/haraj/emirates-properties/abu-dhabi
http://aqarspot.com/forum/general/images/8500-صورة-عن-الصحاب
http://aqarspot.com/forum/haraj/emirates-properties/abu-dhabi/villas-rent/7756-فيلا-رائعة-للايجار-في-معسكر-آل-نهيان-أبوظبي-vl_700
http://aqarspot.com/forum/saudi-properties/western/medina/6748-فيلاة-للبيع-فى-مخطط-التلال-رقم-1-8ط-رقم-القطعه-8
http://aqarspot.com/forum/egypt-properties/cairo/villas-sale/440-فيلا-مميزة-بالرحاب
http://aqarspot.com/forum/egypt-properties/cairo/apartments-sale/shorouk-city

And the server returns a code other than 404 or 410 for a non-existent page (or redirecting users to another page, such as the homepage, instead of returning a 404). This creates a poor experience for searchers and search engines.

My question is how can i repair this error? And if this error effect search engine optimization.
thanks

[Dragonsys]

it is in your header:

<script type="text/javascript">
if (location.hash) {
document.write('<style type="text/css"> a.anchor { display:none;} <\/style>');
}

var uploadUrlTarget = "http://aqarspot.com/uploader/url";
var pageData = {
"baseurl": "http://aqarspot.com",
"baseurl_path": "/",
"baseurl_login": "http://aqarspot.com",
"baseurl_core": "http://aqarspot.com/core",
"pageid": "1",
"pagetemplateid": "1",
"channelid": "1",
"nodeid": "1",
"userid": "0",
"textDirLeft": "right",
"textDirRight": "left",
"textdirection": "rtl",
"can_use_sitebuilder": "",
"cookie_prefix": "bb",
"cookie_path": "/",
"cookie_domain": "",
"sb_state_cookie": "bbsitebuilder_active",
"inlinemod_cookie_name": "inlinemod_nodes",

"pagenum": "1",

"styleid": "0",

"languageid": "2",

"threadmarking": "2",
"lastvisit": "1482507985",
"phrasedate": "1482236238",
"optionsdate": "1481476259",

"current_server_datetime": "1482507985",
"simpleversion": "v=525",

"showhv_post": "1",

"nextcron": "1482508200",
"securitytoken": "guest"
}



</script>


You might start there. Looks to be part of your vb settings. I'm not familiar with vb5 so I can't really help much more than that.

Check and see if the folder core exists in your public_html, it seems like it might have a blank index file in it, as it does not return any errors, just a blank page.