/driver/ADS7841.c:43: error: `ADS7841' undeclared (first use in this function)

I have created a ADS7841 IP core , and add it to Nios II IP core library ,when I use it ,compile display error:../driver/ADS7841.c:43: error: `ADS7841' undeclared (first use in this function),I have define the ADS7841 in the ADS7841 head file ,see the picture ! just for help ,I want solve this problem!thank you.https://www.alteraforum.com/forum/attachment.php?attachmentid=8746 https://www.alteraforum.com/forum/attachment.php?attachmentid=8747