title: Swift How to fix Failed to set user defined inspected property on Please
body: <p>I have problem with storyboard. I installed this: <a href="https://github.com/okmr-d/DOFavoriteButton" rel="nofollow">https://github.com/okmr-d/DOFavoriteButton</a> and putted all effects in a Button correctly but now the storyboard have a lots of error in console and it makes app really slow. How can I fix that? Thank you!</p>
  
  <p><strong>ERRORS</strong>:</p>
  
  <pre><code>&gt; 2015-10-08 19:33:01.629 AppName [45857:6557884] Failed to set (imageColorOn) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8a23a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOn.
  2015-10-08 19:33:01.630 AppName[45857:6557884] Failed to set (imageColorOff) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8a23a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOff.
  2015-10-08 19:33:01.630 AppName[45857:6557884] Failed to set (duration) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8a23a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key duration.
  2015-10-08 19:33:01.938 AppName[45857:6557884] Failed to set (imageColorOn) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8afbb0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOn.
  2015-10-08 19:33:01.938 AppName[45857:6557884] Failed to set (imageColorOff) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8afbb0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOff.
  2015-10-08 19:33:01.938 AppName[45857:6557884] Failed to set (duration) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8afbb0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key duration.
  2015-10-08 19:33:02.104 AppName[45857:6557884] Failed to set (imageColorOn) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8c3a40&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOn.
  2015-10-08 19:33:02.104 AppName[45857:6557884] Failed to set (imageColorOff) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8c3a40&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOff.
  2015-10-08 19:33:02.104 AppName[45857:6557884] Failed to set (duration) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbcec8c3a40&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key duration.
  2015-10-08 19:33:02.257 AppName[45857:6557884] Failed to set (imageColorOn) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbceacae5c0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOn.
  2015-10-08 19:33:02.257 AppName[45857:6557884] Failed to set (imageColorOff) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbceacae5c0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOff.
  2015-10-08 19:33:02.257 AppName[45857:6557884] Failed to set (duration) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbceacae5c0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key duration.
  2015-10-08 19:33:02.553 AppName[45857:6557884] Failed to set (imageColorOn) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbceadd34a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOn.
  2015-10-08 19:33:02.553 AppName[45857:6557884] Failed to set (imageColorOff) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbceadd34a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imageColorOff.
  2015-10-08 19:33:02.553 AppName[45857:6557884] Failed to set (duration) user defined inspected property on (UIButton): [&lt;UIButton 0x7fbceadd34a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key duration.
  </code></pre>