Block Types not working

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Hello everybody,
I am trying to install custom Block Types on my website. But as soon as a click on "Block Types" a "ReflectionException (-1) Class does not exist" shows up on my screen. Everything esle works propperly, it's just the Block Types.

The shown code is:
[ */
public function build($concrete, array $parameters = [])
{
// If the concrete type is actually a Closure, we will just execute it and
// hand back the results of the functions, which allows functions to be
// used as resolvers for more fine-tuned resolution of these objects.
if ($concrete instanceof Closure) {
return $concrete($this, $parameters);
}

$reflector = new ReflectionClass($concrete);

// If the type is not instantiable, the developer is attempting to resolve
// an abstract type such as an Interface of Abstract Class and there is
// no binding registered for the abstractions so we need to bail out.
if (! $reflector->isInstantiable()) {
if (! empty($this->buildStack)) {
$previous = implode(', ', $this->buildStack);

$message = "Target [$concrete] is not instantiable while building [$previous].";
} else {
$message = "Target [$concrete] is not instantiable.";
}

throw new BindingResolutionException($message);
}

$this->buildStack[] = $concrete;

$constructor = $reflector->getConstructor();

]

I allready reinstalled concrete5 and made a new Database.

Thanks for your Help
Alex

 
hutman replied on at Permalink Best Answer Reply
hutman
This usually happens when a namespace is incorrect in a block type. Check the block types that you are trying to install and verify that the namespace is correct.
Alex1234567890 replied on at Permalink Reply
Thanks, that worked, I just had to change one namespace to fix it.
nulpe replied on at Permalink Reply
Hi,
if I want to call the block types via the dashboard, I get the same error message. But I don't have custom blocks installed.

I have installed the following blocks:
Background Image and Overlay v.0.9.9
Simple Gallery v.1.0.7
Easy Image Gallery v.1.4.2

Could it also be the namespace?
If yes, how can I change it?
Are there other reasons for the error message?

Many thanks for your help