Magento1 createBlock method returns "bool(false)" in livehost
Your action code should be
public function minhaactionAction()
{
$this->loadLayout();
$block = $this->getLayout()->createBlock('slideproducts/slideproducts');
var_dump($block);
$block->setTemplate('slideproducts/slideproducts.phtml');
$this->getLayout()->getBlock('content')->append($block);
$this->renderLayout();
}
I suspect that versions of your Magento in localhost and live versions are different.
After Magento version 1.9.1, Magento introduced a new feature of block permissions.
Now if you are introducing a new block class in Magento system, you need to allow it from:
System -> Permissions -> Blocks
Click add new block where block name slideproducts/slideproducts
and isAllowed -> Yes
Now save. Clear cache. Hope this will solve your problem.