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Error when trying to obtain a certificate: The specified item could not be found in the keychain

I was having a problem with codesigning my apps, so I deleted all the keys from the keychain. Then I went to Certificate Assistant => Request a certificate from a Certificate Authority (to create CSR for a new certificate). ...
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Python: using a recursive algorithm as a generator

Recently I wrote a function to generate certain sequences with nontrivial constraints. The problem came with a natural recursive solution. Now it happens that, even for relatively small input, the sequences are several thousands, thus I would prefer to use my algorithm as a generator instead of usin...
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How do I implement a callback in PHP?

How are callbacks written in PHP? 9 Answers 9 ...
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CALayers didn't get resized on its UIView's bounds change. Why?

I have a UIView which has about 8 different CALayer sublayers added to its layer. If I modify the view's bounds (animated), then the view itself shrinks (I checked it with a backgroundColor ), but the sublayers' size remains unchanged . ...
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Running Composer returns: “Could not open input file: composer.phar”

I am new to symfony2 and reading symblog . In third chapter while trying with data-fixtures I tried the command: 36 Answe...
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TypeError: p.easing[this.easing] is not a function

When trying to show a div element with jQuery, i got this error: 10 Answers 10 ...
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How to get ALL child controls of a Windows Forms form of a specific type (Button/Textbox)?

I need to get all controls on a form that are of type x. I'm pretty sure I saw that code once in the past that used something like this: ...
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Error type 3 Error: Activity class {} does not exist

I have an IntelliJ Android project, that I successfully imported to Android Studio 0.4.0. It works perfectly if I don't change anything in manifest. However, when I want to change the launcher activity and run, it fails with this error: ...
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XAMPP, Apache - Error: Apache shutdown unexpectedly

I've just re-installed XAMPP, and when I try to start my Apache server in the XAMPP Control Panel, I now get the following errors: ...
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Haskell function composition (.) and function application ($) idioms: correct use

I have been reading Real World Haskell , and I am nearing the end, but a matter of style has been niggling at me to do with the (.) and ($) operators. ...