The addsample method can only be used for a single timeseries object A specified property is missing a corresponding value. At least one of the specified properties is invalid. A new sample must be specified either as a structure or by Property-Value pairs. Data is missing. Time is missing. Data cannot be empty. Time cannot be empty. The overwrite flag must be a logical. The sample size of the added data does not match the sample size of the time series object. The sample size of the added quality attribute does not match the quality attribute of the time series object. Time must be a numeric value. Time must be a vector. Invalid time format The first argument must specify non-empty data values. The first dimension of the data array must be the same length as the time vector. The last dimension of the data array must be the same length as the time vector. Quality attributes must be specified by integer values. Samples with a non-null quality attribute cannot be added to a time series with an empty quality vector.