Hello Filip:
What part number are you using, is this a KL03?
I think that warning is harmless but if you want to avoid it then you have to disable linker file generation from the Cpu component settings:

Then change one line in the linker file:
From this -> __VECTOR_RAM = ORIGIN(m_interrupts_ram);
To this -> __VECTOR_RAM = __VECTOR_TABLE;
Then the warning should be gone.
Regards!
Jorge Gonzalez