Cortex-M0+ core micro Issue with FreeRTOS integration

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Right. This is the section of the code you posted that installs the three handlers required by FreeRTOS:

        DCD   SVC_Handler                        ; Cortex-M0 SV Call Interrupt
        DCD   0
        DCD   0
        DCD   PendSV_Handler                     ; Cortex-M0 Pend SV Interrupt
        DCD   SysTick_Handler                    ; Cortex-M0 System Tick Interrupt

You can replace the default names for these handlers with the FreeRTOS handlers you have already brought into the file (although you would have to move the import of these symbols up above where you use them).

        EXTERN  vPortSVCHandler
        EXTERN  xPortPendSVHandler
        EXTERN  xPortSysTickHandler

So the same section of the vector table would look like this:

        DCD   vPortSVCHandler                        ; Cortex-M0 SV Call Interrupt
        DCD   0
        DCD   0
        DCD   xPortPendSVHandler                    ; Cortex-M0 Pend SV Interrupt
        DCD   xPortSysTickHandler                    ; Cortex-M0 System Tick Interrupt

Or just #define the default names for these handles to the FreeRTOS names, as per the link in the previous post.