NIOS II: Error message :Symbol "xxxx"cannot be resolved

Hi,

In Nios workspace, i am getting below error messages. How to get rid-off ?

1. Symbol 'ALTERA_AVALON_SPI_CONTROL_SSO_MSK' could not be resolved

2. Symbol 'ALTERA_AVALON_SPI_STATUS_RRDY_MSK' could not be resolved

3. Symbol 'PIO_CLK_BASE' could not be resolved

4. Symbol 'PIO_IN_12_BASE' could not be resolved

5. Symbol 'PIO_IN_2_BASE' could not be resolved

6. Symbol 'PIO_OUT_32_BASE' could not be resolved

7.Symbol 'PIO_OUT_8_BASE' could not be resolved

8. Symbol 'SPI_HV_BASE' could not be resolved

Please find the attachment and suggest me.

Thanks