![*](chapterTOC_bullet.png)
In the Problems view, the error icon
![X](../pam-webhelp/images/UsiApaStu_building_apama_projects.gif)
appears at the beginning of each line that describes an error.
![*](chapterTOC_bullet.png)
In the Project view, the error icon
![X](../pam-webhelp/images/UsiApaStu_building_apama_projects.gif)
appears at the beginning of the name of a project that contains at least one file that is not valid.
![*](chapterTOC_bullet.png)
In the Project view, the error icon
![X](../pam-webhelp/images/UsiApaStu_building_apama_projects.gif)
also appears at the beginning of the name of each file that is not valid.
![*](chapterTOC_bullet.png)
In the file editor, the error icon
![X](../pam-webhelp/images/UsiApaStu_building_apama_projects.gif)
appears at the beginning of each line that contains an error.
![*](chapterTOC_bullet.png)
In the overview scroll bar to the right of the editing pane, regardless of how long the file is, a mark (
![red mark icon](../pam-webhelp/images/UsiApaStu_building_apama_projects_2.gif)
) appears for every error in the file. You can hover over a mark to view a description of the error that it flags, or you can click on any mark to display the line that contains that error.