The “token ‘EOF’ expected” error in Power BI typically signals an incomplete or syntactically incorrect DAX expression. DAX, or Data Analysis Expressions, is the formula language used in Power BI for calculations and data analysis. The error specifically points to the parser encountering the end of the file or input stream (EOF – End Of File) prematurely, suggesting that a necessary element of the DAX formula is missing, such as a closing parenthesis, quote, or operator. An example would be writing `CALCULATE(SUM(Sales[Amount])` without a closing parenthesis for the `CALCULATE` function or omitting a quotation mark in a filter condition like `FILTER(Table, Table[Column] = Value)`.
This error is important because it prevents Power BI from correctly interpreting and executing the intended calculations. Its occurrence often arises from human error during formula creation or modification, particularly when dealing with complex nested functions or extensive calculated columns. Understanding the root cause allows for efficient troubleshooting and correction, ensuring the integrity and reliability of the data analysis within Power BI reports and dashboards. Addressing these errors directly impacts the usability and accuracy of insights derived from the data, leading to better-informed decision-making. Historically, similar parsing errors are common across various programming and scripting languages, requiring careful attention to syntax and structure.
