From the log:
D:\Data\bamboo-home\xml-data\configuration\administration.xml (Access is denied) Could not save setupType:com.atlassian.config.ConfigurationException: Couldn't save bamboo.cfg.xml to D:\Data\bamboo-home directory.
Looks like the account that is running Bamboo doesn't have sufficient permissions.
BTW you're running Bamboo 4.2.1 which is more than 3 years old.
You might want to consider upgrading to a more recent version.
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