The following errors might be encountered during preprocessing.
- Unexpected numeric literal
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- Unexpected alphanumeric literal
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- Unsupported keyword or noise word
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- Unrecognized clause to DISPLAY WINDOW
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- Unrecognized clause to DISPLAY LINE
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- Unrecognized clause to DISPLAY BOX
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- Unrecognized clause to ACCEPT FROM SCREEN
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- This keyword has already been used
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- This keyword conflicts with another
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- This reserved word is used incorrectly
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- Wrongly formed or ordered clause with keyword
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- Error during preprocessing - no further details
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- Unknown COPY file specified
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- WINDOW1 preprocessor cannot handle free format
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- SCROLL/WRAP clause processed as comment
- The edit/compile/animate loop returns to an incorrect line within your source program after returning an error.