I think there is an issue with the way in which you are importing the Thermistor_Calc component.
The project associated along with the AN has a cylib folder named Thermistor_Calc_v1_0.cylib. This cylib should be used to add dependency to the project which requires this component.
Hence, in the project where you want to use the Thermistor_Clac Component go to Project > Dependencies
The Dependencies dialog box opens. In the User Dependencies, click on New Entry.
Now select Thermistor_Calc_v1_0 under Thermistor_Calc_v1_0.cylib folder.
Now the Component will appear in your component catalog in a new tab called CYRef under Thermistor folder. The snap shot below shows the Dependencies dialog box.
It is great ! The error has been solved. Thanks!
But I do not know why other component can be import easily? No need to set the Dependencies? Like SGPIO or FanController?
I am not sure why in your case direct importing of the custom component resulted in an error.
In PSoC Creator, importing of component creates a local copy of the component in the project. This component can be modified.
When dependency is added to a component, the custom component can be used in the project, but cannopt be modified.
I think the answer to your question is when importing other components there is probably not an underlying dependent library, but I am not familiar with the SGPIO or FanController to be sure.
If there is an underlying dependency for those projects, it might be that you already have those dependecies in your design?