Error when checking site information using Drupal 8.6.1

Fresh clean install of 8.6.1 when I go into site information i get this error(turned error checking and messages on):

The website encountered an unexpected error. Please try again later.</br></br><em class="placeholder">InvalidArgumentException</em>: Source path  has to start with a slash. in <em class="placeholder">DrupalCorePathAliasManager-&gt;getAliasByPath()</em> (line <em class="placeholder">186</em> of <em class="placeholder">core/lib/Drupal/Core/Path/AliasManager.php</em>). <pre class="backtrace">DrupalsystemFormSiteInformationForm-&gt;buildForm(Array, Object)
call_user_func_array(Array, Array) (Line: 518)
DrupalCoreFormFormBuilder-&gt;retrieveForm('system_site_information_settings', Object) (Line: 275)
DrupalCoreFormFormBuilder-&gt;buildForm('system_site_information_settings', Object) (Line: 93)
DrupalCoreControllerFormController-&gt;getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber-&gt;DrupalCoreEventSubscriber{closure}() (Line: 582)
DrupalCoreRenderRenderer-&gt;executeInRenderContext(Object, Object) (Line: 124)
DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber-&gt;wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
DrupalCoreEventSubscriberEarlyRenderingControllerWrapperSubscriber-&gt;DrupalCoreEventSubscriber{closure}() (Line: 151)
SymfonyComponentHttpKernelHttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
SymfonyComponentHttpKernelHttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
DrupalCoreStackMiddlewareSession-&gt;handle(Object, 1, 1) (Line: 47)
DrupalCoreStackMiddlewareKernelPreHandle-&gt;handle(Object, 1, 1) (Line: 99)
Drupalpage_cacheStackMiddlewarePageCache-&gt;pass(Object, 1, 1) (Line: 78)
Drupalpage_cacheStackMiddlewarePageCache-&gt;handle(Object, 1, 1) (Line: 47)
DrupalCoreStackMiddlewareReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
DrupalCoreStackMiddlewareNegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
StackStackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 665)
DrupalCoreDrupalKernel-&gt;handle(Object) (Line: 19)
</pre>

Can anyone tell me why? And what i need to do to fix??

Thanks

Drupal version: 


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