无法在Eclipse C中构建项目

Question

单击锤子图标以构建C项目时，弹出窗口会显示以下消息。

Errors occurred during the build.
Errors running builder 'CDT Builder' on project 'Learn C'.
Illegal character in path at index 5: Learn C

作为C首发，老实说我不知道​​这意味着什么，所以有人请帮帮我..