Fatal Error - redeclare error_handler

This is a known limitation with the library the sparkline module uses, and a known problem with Drupal core polluting the namespace.

You will need to rename the duplicate function in the Sparkline library, for now. Sorry.

See core issue http://drupal.org/node/131419.

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It appears that Drupal 5 core will not be changed to fix this conflict. So until then, sparkline users will have to hand edit their sparkline library file to rename the error_handler function.

This is fixed in core in Drupal 6.

You will need to rename the duplicate function in the Sparkline library, for now. Sorry.

I am only a novice at programming. Would you mind specifying the exact items to be renamed including the file names and line numbers? What should the new names be?

I performed a search and replace on all four lib files, changing "error_handler" to "sparkline_error_handler." Unfortunately, using the sparkline filter now just produces a blank page with no error recorded in the logs.

At approximately line 22 in file lib/Object.php, change "function error_handler" to function sparkline_error_handler".

At approximately line 93 in the same file, change "set_error_handler('error_handler')" to "set_error_handler('sparkline_error_handler')".

Thanks, that got it working.