Test Suites - Unable to resolve classes. Is a script needed?

Hello there,

If I run Test Suite from Jenkins at Linux server, in log I can see following outputs:

/PATH%Project.prj/Test Suites/Logging.groovy: 1 Groovy:unable to resolve class com.kms.katalon.core.annotation.SetUp
/PATH%Project.prj/Test Suites/Logging.groovy: 2 Groovy:unable to resolve class com.kms.katalon.core.annotation.SetupTestCase
/PATH%Project.prj/Test Suites/Logging.groovy: 3 Groovy:unable to resolve class com.kms.katalon.core.annotation.TearDown
/PATH%Project.prj/Test Suites/Logging.groovy: 4 Groovy:unable to resolve class com.kms.katalon.core.annotation.TearDownTestCase
/PATH%Project.prj/Test Suites/Logging.groovy: 13 Groovy:class com.kms.katalon.core.annotation.SetUp is not an annotation in @com.kms.katalon.core.annotation.SetUp
/PATH%Project.prj/Test Suites/Logging.groovy: 21 Groovy:class com.kms.katalon.core.annotation.TearDown is not an annotation in @com.kms.katalon.core.annotation.TearDown
/PATH%Project.prj/Test Suites/Logging.groovy: 29 Groovy:class com.kms.katalon.core.annotation.SetupTestCase is not an annotation in @com.kms.katalon.core.annotation.SetupTestCase
/PATH%Project.prj/Test Suites/Logging.groovy: 37 Groovy:class com.kms.katalon.core.annotation.TearDownTestCase is not an annotation in @com.kms.katalon.core.annotation.TearDownTestCase


If I go to the Logging TestSuite, to the Script mode I have:

import com.kms.katalon.core.annotation.SetUp
import com.kms.katalon.core.annotation.SetupTestCase
import com.kms.katalon.core.annotation.TearDown
import com.kms.katalon.core.annotation.TearDownTestCase

/**
 * Some methods below are samples for using SetUp/TearDown in a test suite.
 */

/**
 * Setup test suite environment.
 */
@SetUp(skipped = true) // Please change skipped to be false to activate this method.
def setUp() {
	// Put your code here.
}

/**
 * Clean test suites environment.
 */
@TearDown(skipped = true) // Please change skipped to be false to activate this method.
def tearDown() {
	// Put your code here.
}

/**
 * Run before each test case starts.
 */
@SetupTestCase(skipped = true) // Please change skipped to be false to activate this method.
def setupTestCase() {
	// Put your code here.
}

/**
 * Run after each test case ends.
 */
@TearDownTestCase(skipped = true) // Please change skipped to be false to activate this method.
def tearDownTestCase() {
	// Put your code here.
}

/**
 * References:
 * Groovy tutorial page: http://docs.groovy-lang.org/next/html/documentation/
 */

But, I don’t even use Script mode for Test Suites, only “Main” mode.

Shall I really need that Script page to be filled with code above? Is this script added automatically by Katalon? Or maybe there is other option to hide these logs from execution?