Update problem

When updating from version 6.x.2.0-beta2 to 6.x.2.0-beta3 the following error message appeared after i ran Update.php

votingapi module
Update #6100

* Failed: ALTER TABLE {votingapi_cache} DROP PRIMARY KEY
* Failed: ALTER TABLE {votingapi_cache} CHANGE vote_cache_id `vote_cache_id` INT NOT NULL auto_increment, ADD PRIMARY KEY (vote_cache_id)
* Failed: ALTER TABLE {votingapi_vote} DROP PRIMARY KEY
* Failed: ALTER TABLE {votingapi_vote} CHANGE vote_id `vote_id` INT NOT NULL auto_increment, ADD PRIMARY KEY (vote_id)
* Failed: ALTER TABLE {votingapi_vote} CHANGE hostname `vote_source` VARCHAR(255) DEFAULT NULL
* Failed: ALTER TABLE {votingapi_vote} ADD INDEX content_uid (content_type, content_id, uid)
* Failed: ALTER TABLE {votingapi_vote} ADD INDEX content_source (content_type, content_id, vote_source)
* Failed: ALTER TABLE {votingapi_vote} ADD INDEX content_vtype (content_type, content_id, value_type)
* Failed: ALTER TABLE {votingapi_vote} ADD INDEX content_value_tag (content_type, content_id, value_type, tag)
* Failed: ALTER TABLE {votingapi_cache} ADD INDEX content_function (content_type, content_id, function)
* Failed: ALTER TABLE {votingapi_cache} ADD INDEX content_tag_func (content_type, content_id, tag, function)
* Failed: ALTER TABLE {votingapi_cache} ADD INDEX content_vtype_tag (content_type, content_id, value_type, tag)
* Failed: ALTER TABLE {votingapi_cache} ADD INDEX content_vtype_tag_func (content_type, content_id, value_type, tag, function)

What is causing this?