CocoaPods libraries errors building for some iOS simulators

Question

Short error:

file was built for archive which is not the architecture being linked (i386)

Expanded:
For some simulators, I receive these e

Answer 1

I found the solution.

I removed the directory /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build (right click on the library of CocoaPods > Show in Finder, then find its parent directory) and rebuild all again. Xcode recreated all libraries which works right now. All build preferences are the same as default.

Answer 2

I solved it by deleting the DerivedData directory.

Steps:

1. In Xcode, go to Menu bar → Window → Projects.

2. In the Projects window, choose the project on the left.

3. Click the Delete... button for Derived Data. When asked to confirm, click Delete.

4. Rebuild the project.

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For Xcode 8, see this Q & A:
How to delete derived data in Xcode 8?