Please can someone help me with this.

One of our employees has wrote a VB project in excel 2010 which works on some machines and not others, it comes up with the below error message.

I have checked VB and there are no missing references.

Compile Error: Can't find project or library


Private Sub UserForm_Initialize()

'Empty ClientCodeComboBox
Me.ClientCodeComboBox.Clear

'Fill ClientCodeComboBox
Me.ClientCodeComboBox.List = Worksheets("Index").Range("A2:A" & Worksheets("Index").UsedRange.Rows.Count).Value

'Prepare CompanyCodeBox.Caption
Me.ClientNameLabel.Caption = ""

'Uncheck CompanyCodeCheckBox
Me.CompanyCodeCheckBox.Value = False

'Clear YearEndDateBox
Me.YearEndDateBox.Value = Date
Me.YearEndDateBox.MaxDate = Date

'Clear ScanDateBox
Me.ScanDateBox.Value = Date
Me.ScanDateBox.MaxDate = Date