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<?php
 namespace EssenceSliderSetup;

 use MagentoFrameworkSetupUpgradeSchemaInterface;
 use MagentoFrameworkSetupSchemaSetupInterface;
 use MagentoFrameworkSetupModuleContextInterface;

 class UpgradeSchema implements UpgradeSchemaInterface 
 public function upgrade(
 SchemaSetupInterface $setup,
 ModuleContextInterface $context
 )

 $installer = $setup;
 $installer->startSetup();
 if(version_compare($context->getVersion(), '1.1.0', '<'))
 if(!$installer->tableExists('bt_essence_slider')) 
 $table = $installer->getConnection()->newTable(
 $installer->getTable('bt_essence_slider')
 )
 ->addColumn(
 'id',
 MagentoFrameworkDBDdlTable::TYPE_INTEGER,
 null,
 [
 'identity' => true,
 'nullable' => false,
 'primary' => true,
 'unsigned' => true 
 ],
 'Banner ID'
 )
 ->addColumn(
 'banner_name',
 MagentoFrameworkDBDdlTable::TYPE_TEXT,
 255,
 [
 'nullable' => false
 ],
 'Banner Name'
 )
 ->addColumn(
 'status',
 MagentoFrameworkDBDdlTable::TYPE_SMALLINT,
 null,
 [
 'nullable' => false,
 'default' => '1'
 ],
 'Banner Status: Enabled is: 1, Disabled is: 2'
 )
 ->addColumn(
 'created_at',
 MagentoFrameworkDBDdlTable::TYPE_TIMESTAMP,
 null,
 [
 'nullable' => false,
 'default' => MagentoFrameworkDBDdlTable::TIMESTAMP_INIT,
 ],
 'Created At'
 )
 ->addColumn(
 'updated_at',
 MagentoFrameworkDBDdlTable::TYPE_TIMESTAMP,
 null,
 [
 'nullable' => false,
 'default' => MagentoFrameworkDBDdlTable::TIMESTAMP_INIT_UPDATE,
 ],
 'Updated At'
 )
 ->setComment('Slider Table');
 $installer->getConnection->createTable($table);
 
 
 $installer->endSetup();
 
 

And when I try to run following command:

 php bin magento setup:upgrade

I am getting following error in command line:

 Undefined property: MagentoSetupModuleSetup::$getConnection in UpgradeSchema.php on line 18

I cannot find out what is the problem here. Please help.

getConnection() is function you forgot to mention as function

Your code should be like this

$table = $setup->getConnection()->newTable(
$setup->getTable('bt_essence_slider')

Hope it helps.