Hi wang baode,
Please downloader a new AN2295, then do the next steps:
1: remove bootloader_asm.S
2: change the path of AN2295_linkfile like the following picture:

click browse, choose "AN2295_LinkerFile.lcf" in your folder, then click"apply".
After that , please build it again, you will find there has no error!

Wish it helps you!
Best regards!
Jingjing