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IBM Domino Designer Basic User Guide and Reference
Basic product usage information and programming language reference information.
LotusScript® Language
Welcome to the LotusScript® Language section of Domino® Designer Help.
Error Processing
This chapter describes error processing in the LotusScript® language.
Run-time error processing
A run-time error occurs either when executing a statement results in an error or when LotusScript® executes an Error statement.
Statements used in run-time errors
You include statements in a script to explicitly manage the flow of control when an error occurs.

IBM Domino Designer Basic User Guide and Reference
Basic product usage information and programming language reference information.
- Accessibility and keyboard shortcuts
  Accessibility features assist users who have a disability, such as restricted mobility or limited vision, to use information technology content successfully.
- Application Design
  Welcome to the Application Design section of Domino® Designer Help.
- Application Management
  Welcome to the Application Management section of Domino® Designer Help.
- Domino® Query Language
  Domino Query Language (DQL) is a facility running in Domino core allowing for a terse shorthand syntax for finding documents according to a wide variety of complexity of terms. It leverages existing design elements without the need to write detailed code to access them.
- Composite Applications - Design and Management
  Composite applications are a key element in a service-oriented architecture (SOA) and contextual collaboration strategy. The ability to create and edit composite applications lets you easily integrate different types of components and technologies.
- DB2® Access views
  Domino® Designer includes two types of design elements to assist you in managing data contained in DB2® enabled Notes® databases:
- Programming Overview and User Interface
  This section contains general guidelines and examples that show where to use Java, LotusScript, and the formula language.
- Formula Language
  This section documents the formula language.
- LotusScript® Language
  Welcome to the LotusScript® Language section of Domino® Designer Help.
  - Introduction to LotusScript®
    This chapter introduces LotusScript® and describes, in general terms, how to use the script editor to write and modify scripts, how to compile scripts, and how to use the debugger to locate problems in the logic of your applications.
  - Script and Statement Construction Rules
    This chapter describes the rules for writing the basic elements of a script in the LotusScript® language.
  - Data Types, Constants, and Variables
    This chapter provides information about LotusScript® constants and variables and the data types of the values that they can represent.
  - Expressions and Operators
    This chapter describes the set of LotusScript® operators, how they may be combined with operands to form expressions, and how those expressions are evaluated.
  - Procedures: Functions, Subs, and Properties
  - File Handling
    This chapter describes file handling in the LotusScript® language.
  - Error Processing
    This chapter describes error processing in the LotusScript® language.
    - Types of errors
      LotusScript® recognizes two kinds of errors:
    - Run-time error processing
      A run-time error occurs either when executing a statement results in an error or when LotusScript® executes an Error statement.
      - Informational functions used in run-time errors
        The functions Err, Erl, Error, and Error$ describe the current error, if there is one. LotusScript® assigns a value to each of these functions when an error occurs.
      - Statements used in run-time errors
        You include statements in a script to explicitly manage the flow of control when an error occurs.
        Managing error number and message: Err and Error statements
        On Error Resume Next
        On Error Resume Next specifies that program execution continues with the next statement after the statement that generates the error, instead of specifying an error-handling routine that executes when the error occurs.
        Resuming execution in a calling procedure
        On Error Resume Next has a special meaning in handling an error that occurred in a lesser procedure. LotusScript® considers the procedure call to be the statement that caused the error; so "Next" refers to the next statement in the calling procedure.
        Multiple On Error statements
  - User-Defined Data Types and Classes
    This chapter describes two kinds of custom data structures that you can define in LotusScript®. Each can hold data of different types in a single data structure.
  - Managing Flow in Scripts
    The flow of execution of a script generally follows the sequence of statements in the script. This chapter describes the behavior of particular statements that alter the flow of execution.
  - Managing Asynchronous Web Agents in Domino®
    This chapter describes how to use multiple threads and synchronization to manage HTTP agents with Domino®.
  - Beyond Core LotusScript®
    This chapter discusses the role that LotusScript® plays with IBM® products, your operating environment, other programs, and interactive user applications.
  - LotusScript® Language Reference
    This chapter describes the use of statements, built-in functions, subs, data types, and directives in the LotusScript® language.
  - Language and Script Limits
    This appendix describes LotusScript® language limits of several kinds: for example, the legal ranges in data representation, the limits on numerical specifications within statements, and the maximum number of different kinds of elements that can be defined in a script.
  - Platform Differences
    The LotusScript® language and functionality on the UNIX™ platform, the Macintosh platform, and the OS/400® platform differ in various ways from the language and functionality described in the rest of this language reference. This appendix describes the differences.
  - LotusScript/REXX Integration
    This appendix provides an overview of REXX integration in the LotusScript® language.
  - LotusScript® Aliases
    This appendix lists the LotusScript® aliases and their equivalent text.
  - MIME Charset Names
  - Compile-time Error Messages
    This chapter describes the compile-time error messages in the LotusScript® language.
  - Run-time Error Messages
    This chapter describes the run-time error messages in the LotusScript® language.
- LotusScript/COM/OLE Classes
- Java/CORBA Classes
  This section documents the Java/CORBA classes.
- Lotus® Connectors
  Lotus® Connectors provide native access to a wide variety of DBMS products, ODBC, the platform File system, Enterprise Resource Planning systems, and Transaction Processing systems.
- Javadoc™ for Domino® Designer related APIs
  As part of providing additional Java™ reference documentation, Domino® Designer ships with a help plugin that contains Javadoc™ for additional Domino Designer related APIs.

Statements used in run-time errors

You include statements in a script to explicitly manage the flow of control when an error occurs.

The Err statement sets the error number and optionally specifies an error message for it.
The Error statement creates an error and optionally specifies an error message for it.
The On Error statement specifies how to handle an error.
The On Error Resume Next specifies that program execution continues with the next statement after the statement that generates the error.