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You have an agent requirement that DotNetFramework4.5_x86 exists, but on this agent it doesn't. If the requirement is required, you need to install .NET on that agent machine. TeamCity has detected that .NET is not installed on this machine so your build cannot run.
If the requirement is incorrect and not needed by your build, it can be removed by going under:
Edit build Configuration > Agent Requirements
Then in the table of agent requirements you will see:
DotNetFramework4.5_x86 exists
And there is a button to delete this requirement. Once you delete the requirement, the agent will appear under 'Compatible Agents'.