Error: Cannot use assign-op operators with overloaded objects nor string offsets

i get the below error after i install Libraries API version 8.x-3.x-dev 2017-Mar-15, using Fine Image Upload versions 8.x-2.1-alpha2 and 8.x-1.x-dev 2017-Jun-11

The website encountered an unexpected error. Please try again later.
Error: Cannot use assign-op operators with overloaded objects nor string offsets in Drupal\Core\Asset\LibraryDiscoveryParser->buildByExtension() (line 138 of core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php).
Drupal\Core\Asset\LibraryDiscoveryParser->buildByExtension('fiu') (Line: 87)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibraryDefinitions('fiu') (Line: 66)
Drupal\Core\Asset\LibraryDiscoveryCollector->resolveCacheMiss('fiu') (Line: 148)
Drupal\Core\Cache\CacheCollector->get('fiu') (Line: 44)
Drupal\Core\Asset\LibraryDiscovery->getLibrariesByExtension('fiu') (Line: 58)
Drupal\Core\Asset\LibraryDiscovery->getLibraryByName('fiu', 'image') (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver->doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver->getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver->getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver->getCssAssets(Object, 1) (Line: 291)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.response', Object) (Line: 184)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 166)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
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: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)