A researcher estimates a model with the dependant variable as the daily returns on a given share traded on the Australian stock exchange, and various macroeconomic variables and accounting ratios as independent variables. She attempts to estimate this model, together with five daily dummy variables (one for each day of the week), and a constant term, using EViews. EViews then tells her that it cannot estimate the parameters of the model. Explain what has happened, and how she can fix it.