how to take reference points

[shimonfrancis]

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[shimonfrancis]

i have got an error -Subscripted assignment dimension mismatch.

Error in initUAVAnalysis1 (line 99)
[betas(1,:),meta.refPoints] = initUAVAnalysis(I, gcp, inputs, meta);
what will i do .as i was learning and practising with the test data .