This error occurs if you try to manipulate an element (e.g. `#set`,
`#send_keys`) where the [readonly
attribute](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input#attr-readonly)
is set.
The error message will be improved in the next release.
---
Reply to this email directly or view it on GitHub:
https://github.com/watir/watir-webdriver/issues/256#issuecomment-41382485
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