# Urgent help required#\\ **Category:** Ruby\ **Created:** [October 8, 2010, 2:03am UTC](https://www.ruby-forum.com/t/urgent-help-required-nomethoderror/196179 "2010-10-08T02:03:50Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![datulravi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c37758/32.png) [@datulravi](https://www.ruby-forum.com/u/datulravi)\ **Post date:** [October 8, 2010, 2:03am UTC](https://www.ruby-forum.com/t/urgent-help-required-nomethoderror/196179/1 "2010-10-08T02:03:50Z")
prompts5 = [“Span type”] defaults5 = [“1. Simply supported”] @t\_slab = [“1. Simply supported |2. Interior span |3. End span |4. Cantilever”] list5 = [@t\_slab] title5=“Please select the type of the span” @input\_tslab = inputbox prompts5, defaults5, list5,title5 kay\_array = [1.0, 1.5, 1.3, 0.4] @ka = kay\_array[(@input\_tslab).to\_i-1] If “3. End span” is selected by in the UI, following error is displayed… Error: #\ ---
**Author:** ![datulravi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c37758/32.png) [@datulravi](https://www.ruby-forum.com/u/datulravi)\ **Post date:** [October 8, 2010, 9:13am UTC](https://www.ruby-forum.com/t/urgent-help-required-nomethoderror/196179/2 "2010-10-08T09:13:35Z")
On Fri, Oct 8, 2010 at 2:05 AM, Atul D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > If “3. End span” is selected by in the UI, following error is > displayed… > > Error: #\ "]:Array\> Without knowing what inputbox does, it seems from the error message that it’s returning an Array. If you are sure that what you are after is in the first position of the array, you could do: @ka = kay\_array[@input\_tslab.first.to\_i-1] Jesus. ---
**Author:** ![datulravi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c37758/32.png) [@datulravi](https://www.ruby-forum.com/u/datulravi)\ **Post date:** [October 10, 2010, 3:37am UTC](https://www.ruby-forum.com/t/urgent-help-required-nomethoderror/196179/3 "2010-10-10T03:37:19Z")
On Thu, Oct 7, 2010 at 7:05 PM, Atul D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)wrote: > If “3. End span” is selected by in the UI, following error is > displayed… > > ## Error: #\ > > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). I assume you are using Google sketchup, and you are invoking this method [Homepage | SketchUp Developer](http://code.google.com/apis/sketchup/docs/ourdoc/ui.html#inputbox) If so, you can see they say that it returns nil or an Array, so @input\_tslab would be an Array. Then, you call (@input\_tslab).to\_i, first of all, you do not need parentheses, they don’t do anything. Second, that means you are invoking the to\_i method on the array that @input\_tslab has received from the inputbox method. But to\_i is not a method that Arrays have ( [class Array - RDoc Documentation](http://ruby-doc.org/core/classes/Array.html)). You need to figure out explicitly what will be returned (ie what does this Array actually contain? I know nothing about sketchup, so can only guess that it is the text contents of the inputbox – if it even has a textbox.) And then you need to figure out what you want to do with it. In this case, it looks like you want to associate it with a number. Figure out how to get from what is returned to the desired number. In your particular example, it looks like saying @input\_tslav.first.to\_i will work, but this might be a shaky solution, I’d expect if you get more familiar with the API this will be easier for you. Also, make sure to handle the situation where the user cancels the box, and nil is returned.