# Error in perspective popup \`onStartup\` script when opening screen in designer, object does not support item assignment **URL:** \ **Category:** Ignition\ **Tags:** perspective, scripting\ **Created:** [February 1, 2024, 7:30am UTC](https://forum.inductiveautomation.com/t/error-in-perspective-popup-onstartup-script-when-opening-screen-in-designer-object-does-not-support-item-assignment/85075 "2024-02-01T07:30:00Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![tarun\_kapure](https://avatars.discourse-cdn.com/v4/letter/t/6bbea6/32.png) [@tarun\_kapure](https://forum.inductiveautomation.com/u/tarun_kapure)\ **Post date:** [February 1, 2024, 7:30am UTC](https://forum.inductiveautomation.com/t/error-in-perspective-popup-onstartup-script-when-opening-screen-in-designer-object-does-not-support-item-assignment/85075/1 "2024-02-01T07:30:00Z")
com.inductiveautomation.ignition.common.script.JythonExecException: Traceback (most recent call last): File "", line 13, in runAction TypeError: 'instancemethod' object does not support item assignment at org.python.core.Py.TypeError(Py.java:234) at org.python.core.PyObject. **setitem** (PyObject.java:731) at org.python.pycode.\_pyx193.runAction$1(:17) at org.python.pycode.\_pyx193.call\_function() at org.python.core.PyTableCode.call(PyTableCode.java:173) at org.python.core.PyBaseCode.call(PyBaseCode.java:306) at org.python.core.PyFunction.function\_\_\_call\_\_(PyFunction.java:474) at org.python.core.PyFunction. **call** (PyFunction.java:469) at org.python.core.PyFunction. **call** (PyFunction.java:464) at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:847) at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:829) at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$TrackingProjectScriptManager.runFunction(ProjectScriptLifecycle.java:868) at com.inductiveautomation.ignition.common.script.ScriptManager$ScriptFunctionImpl.invoke(ScriptManager.java:1010) at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$AutoRecompilingScriptFunction.invoke(ProjectScriptLifecycle.java:950) at com.inductiveautomation.perspective.gateway.script.ScriptFunctionHelper.invoke(ScriptFunctionHelper.java:161) at com.inductiveautomation.perspective.gateway.script.ScriptFunctionHelper.invoke(ScriptFunctionHelper.java:98) at com.inductiveautomation.perspective.gateway.action.ScriptAction.runAction(ScriptAction.java:80) at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.lambda$call$0(ActionCollection.java:263) at com.inductiveautomation.perspective.gateway.api.LoggingContext.mdc(LoggingContext.java:54) at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.call(ActionCollection.java:252) at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.call(ActionCollection.java:221) at com.inductiveautomation.perspective.gateway.threading.BlockingTaskQueue$TaskWrapper.run(BlockingTaskQueue.java:154) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at com.inductiveautomation.perspective.gateway.threading.BlockingWork$BlockingWorkRunnable.run(BlockingWork.java:58) at java.base/java.lang.Thread.run(Unknown Source) Caused by: org.python.core.PyException: TypeError: 'instancemethod' object does not support item assignment ... 28 common frames omitted ---
**Author:** ![pascal.fragnoud](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pascal.fragnoud/32/24728_2.png) [@pascal.fragnoud](https://forum.inductiveautomation.com/u/pascal.fragnoud)\ **Post date:** [February 1, 2024, 8:45am UTC](https://forum.inductiveautomation.com/t/error-in-perspective-popup-onstartup-script-when-opening-screen-in-designer-object-does-not-support-item-assignment/85075/2 "2024-02-01T08:45:03Z")
Hello and welcome aboard, Here are a few tips to make your stay with us pleasant for everyone: - when posting code, stack traces, error messages... use the built-in code formatting tool, it makes things much more readable by using a monospaced font and preserving indentation - make the title descriptive, but keep it short. You can add details in the body of the post. - when asking for help fixing an error, show the code/what you're doing. We can't help you find what's wrong without access to what have. - we are NOT support, only users willing to share what we know. Keep that in mind when posting. - even if we were support, we'd still be human people (I think ?) and it's usually a good idea to observe at least some basic level of politeness when addressing human people. Especially when asking for help. Here, the error tells us that on line 13 of a script assigned to the `onStartup` event of your view, you're trying to assign a value to something that's read-only or not built to receive values. For more details, we'll need to see the code. And remember: when posting code, use the formatting tool. Post the actual code, not a screenshot.