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Runtime error 217 at 004087F5
217 is usually an exception that occurs before SysUtils is initialised or after it is finalised. Presumably paclient is failing, causing this error. It may be failing when --Clean is being passed to it, so you may want to do this manually. i.e remove the files in the .\Android\Debug\Project6 folder (or the whole Debug folder and its contents), and the C:\Users\UserName\Documents\Embarcadero\Studio\Projects\Tests\Project6.@emb.tmp file.
Does the error occur if you separate project, from scratch? (just a blank one should do)