This is the error I am getting:
[2018-02-23 17:21:54] grav.CRITICAL: An exception has been thrown during the rendering of a template ("Illegal offset type in isset or empty"). - Trace: #0 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(403): Twig_Template->displayWithErrorHandling(Array, Array) #1 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(467) : eval()'d code(98): Twig_Template->display(Array) #2 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(432): __TwigTemplate_87f269f14f64e392c614467ff72ec5f9d0a04fc2d8bceb7e56e158e1a1ddcea1->doDisplay(Array, Array) #3 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(403): Twig_Template->displayWithErrorHandling(Array, Array) #4 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(467) : eval()'d code(143): Twig_Template->display(Array) #5 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(215): __TwigTemplate_18e4cfdceca5b359d50b4eb88050ca7146c8a3e4cc535ff5cc7115e1c6f4367c_1793451404->block_content(Array, Array) #6 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(467) : eval()'d code(429): Twig_Template->displayBlock('content', Array, Array) #7 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(215): __TwigTemplate_a270c09822c6dcb2d44aebc0913693a3c45eb0ea76497357e3953a883ffba622->block_body(Array, Array) #8 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(467) : eval()'d code(241): Twig_Template->displayBlock('body', Array, Array) #9 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(432): __TwigTemplate_a270c09822c6dcb2d44aebc0913693a3c45eb0ea76497357e3953a883ffba622->doDisplay(Array, Array) #10 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(403): Twig_Template->displayWithErrorHandling(Array, Array) #11 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(467) : eval()'d code(115): Twig_Template->display(Array, Array) #12 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(432): __TwigTemplate_18e4cfdceca5b359d50b4eb88050ca7146c8a3e4cc535ff5cc7115e1c6f4367c_1793451404->doDisplay(Array, Array) #13 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(403): Twig_Template->displayWithErrorHandling(Array, Array) #14 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(467) : eval()'d code(19): Twig_Template->display(Array) #15 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(432): __TwigTemplate_18e4cfdceca5b359d50b4eb88050ca7146c8a3e4cc535ff5cc7115e1c6f4367c->doDisplay(Array, Array) #16 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(403): Twig_Template->displayWithErrorHandling(Array, Array) #17 /nisp-cms/vendor/twig/twig/lib/Twig/Template.php(411): Twig_Template->display(Array) #18 /nisp-cms/vendor/twig/twig/lib/Twig/Environment.php(363): Twig_Template->render(Array) #19 /nisp-cms/system/src/Grav/Common/Twig/Twig.php(349): Twig_Environment->render('filter.html.twi...', Array) #20 /nisp-cms/system/src/Grav/Common/Service/OutputServiceProvider.php(27): Grav\Common\Twig\Twig->processSite('html') #21 /nisp-cms/vendor/pimple/pimple/src/Pimple/Container.php(118): Grav\Common\Service\OutputServiceProvider->Grav\Common\Service\{closure}(Object(Grav\Common\Grav)) #22 /nisp-cms/system/src/Grav/Common/Processors/RenderProcessor.php(19): Pimple\Container->offsetGet('output') #23 /nisp-cms/system/src/Grav/Common/Grav.php(132): Grav\Common\Processors\RenderProcessor->process() #24 /nisp-cms/system/src/Grav/Common/Grav.php(379): Grav\Common\Grav->Grav\Common\{closure}() #25 [internal function]: Grav\Common\Grav::Grav\Common\{closure}('render', 'Render', Object(Closure)) #26 /nisp-cms/system/src/Grav/Common/Grav.php(355): call_user_func_array(Object(Closure), Array) #27 /nisp-cms/system/src/Grav/Common/Grav.php(133): Grav\Common\Grav->__call('measureTime', Array) #28 /nisp-cms/index.php(52): Grav\Common\Grav->process() #29 {main} [] []