Hello,
If you want to use components from the "mcuoneclipse" site you cannot use Kinetis SDK. When you create a new Kinetis Project with Kinetis SDK and Processor Expert the Kinetis SDK header files (definitions) are used instead.
Create the new project by the following way:
- Select File > New > Kinetis Project to create a new project
- Write the name of the new project, click on the Next button
- Select the KL26Z derivative and click on the Next button:

- Select Kinetis SDK: None and check Processor Expert, click on the Next button:

- Select the target compiler (use the default) and click on the Finish button.
A new Processor Expert project is created (without Kinetis SDK) that contain the required definition of the PE_Types.h, see below:

Best Regards,
Marek Neuzil