Errors during reinstall

Attempted to do a reinstall on component and get the following errors:



JInstaller: :Install: Error SQL DB function failed with error number 1060
Duplicate column name 'actionbyclick' SQL=ALTER TABLE `j25_zhgooglemaps_markers` ADD `actionbyclick` tinyint(1) NOT NULL default '1';
SQL =

ALTER TABLE `#__zhgooglemaps_markers` ADD `actionbyclick` tinyint(1) NOT NULL default '1';

Component Update: SQL error file DB function failed with error number 1060
Duplicate column name 'actionbyclick' SQL=ALTER TABLE `j25_zhgooglemaps_markers` ADD `actionbyclick` tinyint(1) NOT NULL default '1';
SQL =

ALTER TABLE `#__zhgooglemaps_markers` ADD `actionbyclick` tinyint(1) NOT NULL default '1';

I was able to reinstall the module and additional elements appeared, so I am
still working on trying to get the placemarks to appear. Any suggestions on
solving problem?

If you use backup utility to backup-restore, it can not correctly work, because it can not save database structures (tables).

If you want and haven't information you want to save - reinstall it at all - by extension manager - uninstall component, install again. But in this case you lost your data.

As for not displaying placemarks - just install component and get page link. If you can't - then unpublish all placemarks on map, look at map that all OK, then publish one by one your placemarks. And check browser console for errors.