Robotframework IF

I have a for loop, and inside it an If statement. My can't execute corretly the if statement. Log says, no keyword with = What could be the problem?

:FOR  ${Line}  IN  @{Lines} 
   \  Run keyword If  ${Line_Count} == 1  
   \  ...  ${File}=  BuiltIn.Catenate  SEPARATOR=\n  ${File}  ${Line}