KUKA Robot codes
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KUKA Robot Controller

System · Basic

Alarm KRC0721

KUKA Robot KRC0721 - ’{’ EXPECTED 2057

This syntax error occurs when the KRL compiler expects an opening curly brace '{' at a specific location in the source code but fails to find it. The error typically indicates a missing opening brace in a function, structure definition, or control flow statement within the program object.

KUKA RobotSystemBasic

KRC0721

KUKA Robot KRC0721 - ’{’ EXPECTED 2057

’{’ EXPECTED 2057

This syntax error occurs when the KRL compiler expects an opening curly brace '{' at a specific location in the source code but fails to find it. The error typically indicates a missing opening brace in a function, structure definition, or control flow statement within the program object.

Common Causes

  • Missing opening brace '{' after function declaration or definition
  • Missing opening brace '{' after conditional statements (IF, WHILE, FOR, SWITCH)
  • Incorrect or mismatched brace pairing from previous code sections
  • Missing opening brace '{' in structure or array initialization
  • Copy-paste errors or incomplete code fragments during program editing

Troubleshooting Steps

  1. 1Open the affected KRL source file and navigate to the line number indicated in the error message
  2. 2Review the syntax immediately before the error location for missing opening braces '{'
  3. 3Check all function declarations, control structures, and block statements for proper brace pairing
  4. 4Compare the indentation and brace structure against KUKA KRL syntax guidelines and similar code blocks
  5. 5Use the KRL editor's brace matching feature to identify unmatched or missing braces throughout the file
  6. 6Correct the syntax error by adding the required opening brace and recompile the program

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