Q: We have problems using the Losses and uncertainties tool. It shows the error below:
The item has already been added. Key contained in the dictionary: '0'; key being added: '0'
A: The issue arises because the power curve file must contain only records with positive integer velocity values, which can be written with decimal places (0.0, 1.0, 2.0, ...). When velocity with the first decimal place different from zero are included (e.g. 0.5, 1.5, 2.5 ...) the tool presents the mentioned issues.