A small clarification:
Adding a pair of supplies to generate rails netlabeled as +5V and -5V, fixes the problem and it then runs OK using Run the Document.
However it is a bit more complicated than that because in your other sheet you have a pair of +/-5V rails labelled as VCC and VEE so even when you use Run the Project the IQ sheet still has no power because it's rails are called +5V and -5V so they don't connect across the sheets.
If you change the +/-5V supply netlabels so that they are the same on both sheets (say VCC and VEE but you can use any names you like) then using Run the Project will run OK.
But the IQ sheet will not run on it's own because ngspice does not find the supplies on the unused sheet.
Should read as:
However it is a bit more complicated than that because in your other sheet you have a pair of +/-5V rails labelled as VCC and VEE so even when you use Run the Project the IQ sheet still has no power because it's rails are called +5V and -5V so they don't connect across the sheets.
If you change the +/-5V supply netlabels so that they are the same on both sheets (say VCC and VEE but you can use any names you like) then using Run the Project will run OK.
But the IQ sheet will not run on it's own using Run the Document because ngspice does not find the supplies on the other, ignored sheet.
Adding a pair of supplies to generate rails netlabelled as +5V and -5V, to the IQ sheet fixes the problem and it then runs OK using either Run the Document or Run the Project.
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