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Had the same problem and identified two issues

interface/modifyconstraintactivitiesmaxsimultaneousinselectedtimeslotsform_template.ui

was named

interface/modifyconstraintactivitiesmaxsimultaneousinselectedtimeslotsform_template.u

and also that the compile target when importing the project needs to be 32 bit and 64bit needs to be turned off.