# Error in Expression Binding **URL:** \ **Category:** Ignition\ **Created:** [May 30, 2020, 9:40pm UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186 "2020-05-30T21:40:56Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![dghoskins](https://avatars.discourse-cdn.com/v4/letter/d/49beb7/32.png) [@dghoskins](https://forum.inductiveautomation.com/u/dghoskins)\ **Post date:** [May 30, 2020, 9:40pm UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186/1 "2020-05-30T21:40:57Z")
Hi, I am making a template for a pump on a VFD. I have a template parameter VFDTag which I use in expression bindings. Most work fine, however I need to change the color of the Fill Paint for several shapes based on the status of a “Running” tag. I am using the following expression: if((tag(’[default]Pumps/VFD’ + {VFD.VFDTag} + ‘/Running’)),color(255,250,250),color(155,140,140)) The expression changes the Fill Paint color but I also get (2) repeated error messages: java.lang.ClassCastException: Cannot coerce value ‘true’ into type: interface java.awt.Paint at com.inductiveautomation.ignition.common.TypeUtilities.coerce(TypeUtilities.java:1427) at com.inductiveautomation.factorypmi.application.binding.AbstractPropertyAdapter.setQValue(AbstractPropertyAdapter.java:222) at com.inductiveautomation.factorypmi.application.binding.AbstractPropertyAdapter.updateValue(AbstractPropertyAdapter.java:264) at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter.runExpression(ExpressionPropertyAdapter.java:89) at com.inductiveautomation.factorypmi.application.binding.ExpressionPropertyAdapter$1.run(ExpressionPropertyAdapter.java:59) at com.inductiveautomation.ignition.client.util.EDTUtil$ProcessQueue.run(EDTUtil.java:127) at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.EventQueue$4.run(Unknown Source) at java.desktop/java.awt.EventQueue$4.run(Unknown Source) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.desktop/java.awt.EventDispatchThread.run(Unknown Source) Ignition v8.0.12 (b2020042115) Java: Azul Systems, Inc. 11.0.6 Is there any way to eliminate the error messages? Thanks, Dennis Hoskins ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [May 31, 2020, 7:25am UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186/2 "2020-05-31T07:25:30Z")
Considering you’re not using tags for your colours, you can just use an indirect binding and select your colours instead from the colour pickers ---
**Author:** ![kgamble](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kgamble/32/8019_2.png) [@kgamble](https://forum.inductiveautomation.com/u/kgamble)\ **Post date:** [May 31, 2020, 11:33am UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186/3 "2020-05-31T11:33:49Z")
Also if possible using the hex string instead of the color() expression may solve this too ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [May 31, 2020, 11:55am UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186/4 "2020-05-31T11:55:32Z")
I’ve only ever had issues using `color(...)` if i’m trying to use it in combination with strings (e.g. HEX, or even just the RGB values as a string). The expression language doesn’t handle type-casting, I think it grabs the data type from the first return value (in an if, that would be the true value) and expects that data type for all return values ---
**Author:** ![dghoskins](https://avatars.discourse-cdn.com/v4/letter/d/49beb7/32.png) [@dghoskins](https://forum.inductiveautomation.com/u/dghoskins)\ **Post date:** [May 31, 2020, 3:37pm UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186/5 "2020-05-31T15:37:03Z")
Thank you nminchin, that worked although I think my original approach should have also worked. Dennis ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [May 31, 2020, 9:05pm UTC](https://forum.inductiveautomation.com/t/error-in-expression-binding/35186/6 "2020-05-31T21:05:57Z")
Yes, it should have worked, not sure why you were getting errors 🤔