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I have a VF page that uses standard controller account. I want to modify the error message that is displayed when I type the wrong id (invalid) in the URL to avoid getting a message like this: (I want to still display the VFPage but with a custom message)

February 23, 2016
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goabhigo
You can use <apex:pageMessages /> (https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessages.htm) in the VF page and send the custom message from the controller using ApexPages.addMessage() (https://developer.salesforce.com/docs/atlas.en-us.200.0.pages.meta/pages/apex_pages_message.htm). Easier usage of .addMessage - ApexPages.addmessage(new ApexPages.message(ApexPages.severity.WARNING,'Your error message here'));

If you want more info please refer to the following links:
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessages.htm
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessage.htm
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_messages.htm
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_message.htm
Difference between all these methods - https://developer.salesforce.com/forums?id=906F00000008xuuIAA

Hope this helps.

--
Abhi.

February 23, 2016
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I have a VF page that uses standard controller account. I want to modify the error message that is displayed when I type the wrong id (invalid) in the URL to avoid getting a message like this: (I want to still display the VFPage but with a custom message)

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