Warning: explode() expects parameter 2 to be string, array given in menu_attributes_get_attributes()

Warning: explode() expects parameter 2 to be string, array given in menu_attributes_get_attributes() (line 374 of modules\menu_attributes\menu_attributes.module).

menu_attributes_get_attributes(Object) (Line: 313)
menu_attributes_set_attributes(Array) (Line: 334)
menu_attributes_set_attributes(Array) (Line: 300)
menu_attributes_preprocess_menu(Array, 'menu__main', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('menu__main', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 55)
__TwigTemplate_7a08fef427baeb10283e825a8ec36cd7cc4cad50b8fbd308fb1f5fda32f2ecc6->doDisplay(Array, Array) (Line: 427)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 398)
Twig\Template->display(Array) (Line: 406)
Twig\Template->render(Array) (Line: 64)
twig_render_template('modules/nice_menus/templates/nice_menus.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('nice_menus', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 99)
__TwigTemplate_6b338b0016ec5a1028f6e463daf38c4ae9ed415cf6e1a2f75fba01a7e7f6ce2b->block_content(Array, Array) (Line: 216)
Twig\Template->displayBlock('content', Array, Array) (Line: 84)
__TwigTemplate_6b338b0016ec5a1028f6e463daf38c4ae9ed415cf6e1a2f75fba01a7e7f6ce2b->doDisplay(Array, Array) (Line: 427)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 398)
Twig\Template->display(Array) (Line: 406)
Twig\Template->render(Array) (Line: 64)
twig_render_template('themes/iscras/templates/block.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('block', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array) (Line: 450)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 71)
__TwigTemplate_e39e0473be86c8992cca2e6996504ac20f4d6935c4cb805fcf25f865d8012174->doDisplay(Array, Array) (Line: 427)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 398)
Twig\Template->display(Array) (Line: 406)
Twig\Template->render(Array) (Line: 64)
twig_render_template('themes/iscras/templates/page.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 102)
__TwigTemplate_b21ee2e4248c7da8b97f1cd79315839abcd1820a5ad5dcf4bd919977bec60cbe->doDisplay(Array, Array) (Line: 427)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 398)
Twig\Template->display(Array) (Line: 406)
Twig\Template->render(Array) (Line: 64)
twig_render_template('core/themes/classy/templates/layout/html.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
call_user_func(Array, Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 693)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)