Jira REST endpoint redirected to error page - jira

Question

I am using a REST endpoint and here is my code: and here are some screenshots. The first screenshot shows the declaration of the condition and the denclaration of the Link: /rest/scriptrunner/latest/custom/callSubTaskCreator?issueId=${issue.id}. The second screenshot shows the declaration of the REST endpoint. I am specifying the link of a file in the script editor. Finally, the last screenshot shows the error page where I am redirected after clicking on the link.
as you can see I am redirected to an error page after I click on the button. Anyone knows what is wrong?
package CreateMultipleSubtasks
import com.onresolve.scriptrunner.runner.rest.common.CustomEndpointDelegate
import groovy.json.JsonBuilder
import groovy.transform.BaseScript
import com.atlassian.jira.issue.Issue;
import javax.ws.rs.core.MultivaluedMap
import javax.ws.rs.core.Response
import com.atlassian.jira.component.ComponentAccessor
import com.onresolve.scriptrunner.runner.ScriptRunnerImpl
import com.atlassian.sal.api.ApplicationProperties
import com.atlassian.sal.api.UrlMode
import org.apache.log4j.Logger
import com.atlassian.jira.project.Project
import com.atlassian.jira.bc.project.component.ProjectComponent
import com.atlassian.jira.project.ProjectManager
#BaseScript CustomEndpointDelegate delegate
callSubTaskCreator(httpMethod: "GET", groups: ["jira-users"]) {
MultivaluedMap queryParams, String body ->
def log = Logger.getLogger("atlassian-jira.log")
log.warn("I AM HERE MOUNA 1");
ConfigurationCreateMultipleSubtasks conf = new ConfigurationCreateMultipleSubtasks()
def subTaskCreatorHashMap= conf.getSubTaskCreatorHashMap()
String itracCreatemultiplesubtasksProjectCategoriesURL = subTaskCreatorHashMap["itracCreatemultiplesubtasksProjectCategoriesURL"];
def user = ComponentAccessor.jiraAuthenticationContext?.loggedInUser
Issue issue = ComponentAccessor.getIssueManager().getIssueObject(queryParams.getFirst("issueId") as Long)
def itracCreatemultiplesubtasksProjectCategoriesURL2 = itracCreatemultiplesubtasksProjectCategoriesURL.replaceAll(":1:", issue.getKey())
def itracCreatemultiplesubtasksProjectCategoriesURL3 = itracCreatemultiplesubtasksProjectCategoriesURL2.replaceAll(":2:", user.getUsername())
Response.temporaryRedirect(URI.create(itracCreatemultiplesubtasksProjectCategoriesURL3)).build()
 
}