What does a red triangle mean when it is displayed in the expression editor?

A red triangle displayed in the expression editor signifies a syntax error within the expression being evaluated. This visual cue is an important tool for developers, as it alerts them that there is an issue with the structure of the code that needs correction before it can execute properly.

Syntax errors can occur for various reasons, such as missing parentheses, misused operators, or incorrect formatting of functions. When the editor identifies these problems, it marks the area with a red triangle to draw attention to the need for immediate fixes. Emphasizing the importance of resolving these syntax errors ensures that developers can build reliable and functional applications on the Appian platform.

In contrast, other signage may indicate different issues; for example, an undefined variable would likely produce a different warning and an incompatible data type may not necessarily trigger a visual cue until you attempt to run the expression. Therefore, understanding the specific meaning of the red triangle helps streamline debugging and maintains the integrity of the development process.