Colon in entity reference error

Hello,

I keep getting the following error:

Entity names, PI targets, notation names and attribute values declared to be
of types ID, IDREF(S), ENTITY(IES) or NOTATION cannot contain any colons.
Line 4, Position 1295

with the arrow pointing to this point:

<image source="C:\Program Files\Sample\ToneFig3.tif"/>

Any help would be greatly appreciated,

Jacqueline


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