Expression evaluation error: Syntax error.

Question

Receiving the following error on the Interface I am working on.: 
 "Expression evaluation error: Syntax error. Details: Expression evaluation error at function a!columnsLayout parameter 1 [line 285]: Keyword and non-keyword arguments must not be mixed. Used in: columnlayout." 
 
 Code mentioned is as follows:

Mathieu Drouin · Answer

I suspect you might be missing the "columns" keyword in the ColumnsLayout. 
 {
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {}
 ),
 a!columnLayout(
 contents: {}
 )
 }
 )
}

Sanchit Gupta (Xebia) · Answer

Hey, I'm sure the intention was not wrong there, the error messages in Appian are very meaningful and straight forward and it is easy to identify the issue by just reading them. I understand that you are a Newbie and can have a hard time figuring out what is going on sometimes but sometimes it is hard to notice that question is posted in "New to Appian" category and I'm sure this was the case here as well. 
 I can easily reproduce this error when I try to provide a value to a parameter in columnLayout() without its keyword. Try to understand it this way, if you have provided a keyword to any of the parameter in a component then it is must that you have to provide the same for each parameter, o/w it will result in this error. 
 Please see these different examples for more clear understanding and don't hesitate to share the code if you are not able to solve it.

Mathieu Drouin · Answer

I just took the code snippet above and put it inside a columnsLayout and it is working fine. Likely the problem is happening just above. 
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!textField(
 label: "PVQ:",
 labelPosition: "ABOVE",
 value: a!defaultValue("", "–"),
 readOnly: true
 ),
 a!textField(
 label: "Final Settlement:",
 labelPosition: "ABOVE",
 value: if(isnull("", ), "–", text("", "#.##")),
 readOnly: true
 ),
 a!textField(
 label: "Demand:",
 labelPosition: "ABOVE",
 value: if(isnull("", ), "–", text("", "#.##")),
 readOnly: true
 ),
 a!textField(
 label: "KBB Value:",
 labelPosition: "ABOVE",
 value: if(isnull("", ), "–", text("", "#.##")),
 readOnly: true
 ),
 
 }
 )
 }
)

Expression evaluation error: Syntax error.

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