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Apex Data Loader Login Issue

Hi, I am getting below error and am not able to login into apex data loader. INVALID API VERSION SPECIFIED ON URL apex data loader version = 21.0 server host url: https://test.salesforce.com Please let me know how this can be resolved. regards, asif

You are trying to use the spring '11 data loader on an instance that hasn't been upgraded to spring '11 yet. either use the v20.0 data loader, or wait for the upgrade.