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In the world of JavaScript you've got to be careful . My humble guess is that one of your scripts isoverriding the native String.format. If this is the case you'll have to figure out how to have both your other script and Ext JS on the same page. Ext JS also overrides String.format and my component relies on the Ext method.
For more information about overrides and global variables, check this tool I created:
https://mankz.com/code/GlobalCheck.htm
For more information about overrides and global variables, check this tool I created:
https://mankz.com/code/GlobalCheck.htm