KSE 7.4.0 not able to use Customkeyword (python) inside WebUI block

Windows 10 64 bit
KSE 7.4.0

this block no issues
int ind = 0
def shot = “demoshot”+ind+".png"
WebUI.openBrowser(null)
WebUI.navigateToUrl(GlobalVariable.URL_Application)
WebUI.takeScreenshot(screenshots+""+shot)
def path = screenshots+""+shot
print(path)
WebUI.delay(10)
//def text = CustomKeywords.‘demo.PythonKeywords.getimagetext’(path)
ind++
WebUI.closeBrowser()
//print(text[0])

but with this block
int ind = 0
def shot = “demoshot”+ind+".png"
WebUI.openBrowser(null)
WebUI.navigateToUrl(GlobalVariable.URL_Application)
WebUI.takeScreenshot(screenshots+""+shot)
def path = screenshots+""+shot
print(path)
WebUI.delay(5)
def text = CustomKeywords.‘demo.PythonKeywords.getimagetext’(path)
print(text[0])
ind++
WebUI.closeBrowser()

getting errors
groovy.lang.MissingMethodException: No signature of method: com.kms.katalon.core.webui.driver.SmartWaitWebDriver.getSessionId() is applicable for argument types: () values: []
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:58)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:49)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
at demo.PythonKeywords.runPython(PythonKeywords.groovy:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)
at groovy.lang.DelegatingMetaClass.invokeMethod(DelegatingMetaClass.java:151)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
at demo.PythonKeywords.getimagetext(PythonKeywords.groovy:13)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:812)
at groovy.lang.DelegatingMetaClass.invokeMethod(DelegatingMetaClass.java:144)
at demo.PythonKeywords.invokeMethod(PythonKeywords.groovy)
at com.kms.katalon.core.main.CustomKeywordDelegatingMetaClass.invokeStaticMethod(CustomKeywordDelegatingMetaClass.java:50)
at org.codehaus.groovy.runtime.callsite.StaticMetaClassSite.call(StaticMetaClassSite.java:53)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at Script1589480965982.run(Script1589480965982.groovy:34)
at com.kms.katalon.core.main.ScriptEngine.run(ScriptEngine.java:194)
at com.kms.katalon.core.main.ScriptEngine.runScriptAsRawText(ScriptEngine.java:119)
at com.kms.katalon.core.main.TestCaseExecutor.runScript(TestCaseExecutor.java:337)
at com.kms.katalon.core.main.TestCaseExecutor.doExecute(TestCaseExecutor.java:328)
at com.kms.katalon.core.main.TestCaseExecutor.processExecutionPhase(TestCaseExecutor.java:307)
at com.kms.katalon.core.main.TestCaseExecutor.accessMainPhase(TestCaseExecutor.java:299)
at com.kms.katalon.core.main.TestCaseExecutor.execute(TestCaseExecutor.java:233)
at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:114)
at com.kms.katalon.core.main.TestCaseMain$runTestCase$0.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at TempTestCase1589555094778.run(TempTestCase1589555094778.groovy:25)
at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:263)
at groovy.lang.GroovyShell.run(GroovyShell.java:518)
at groovy.lang.GroovyShell.run(GroovyShell.java:507)
at groovy.ui.GroovyMain.processOnce(GroovyMain.java:653)
at groovy.ui.GroovyMain.run(GroovyMain.java:384)
at groovy.ui.GroovyMain.process(GroovyMain.java:370)
at groovy.ui.GroovyMain.processArgs(GroovyMain.java:129)
at groovy.ui.GroovyMain.main(GroovyMain.java:109)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:109)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:131)
2020-05-15 18:06:03.514 ERROR c.k.katalon.core.main.TestCaseExecutor - :x: Test Cases/ReadImageTxt/readImageText FAILED.
Reason:
java.lang.NullPointerException: Cannot invoke method getAt() on null object
at readImageText.run(readImageText:35)
at com.kms.katalon.core.main.ScriptEngine.run(ScriptEngine.java:194)
at com.kms.katalon.core.main.ScriptEngine.runScriptAsRawText(ScriptEngine.java:119)
at com.kms.katalon.core.main.TestCaseExecutor.runScript(TestCaseExecutor.java:337)
at com.kms.katalon.core.main.TestCaseExecutor.doExecute(TestCaseExecutor.java:328)
at com.kms.katalon.core.main.TestCaseExecutor.processExecutionPhase(TestCaseExecutor.java:307)
at com.kms.katalon.core.main.TestCaseExecutor.accessMainPhase(TestCaseExecutor.java:299)
at com.kms.katalon.core.main.TestCaseExecutor.execute(TestCaseExecutor.java:233)
at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:114)
at com.kms.katalon.core.main.TestCaseMain$runTestCase$0.call(Unknown Source)
at TempTestCase1589555094778.run(TempTestCase1589555094778.groovy:25)

without WebUI block this CustomKeyword works fine
def text = CustomKeywords.‘demo.PythonKeywords.getimagetext’(path)
print(text[0])

See these two posts from @ThanhTo

hi,

but i am not using remote webdriver

((RemoteWebDriver) (((EventFiringWebDriver) driver).getWrappedDriver())).getCapabilities()