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### Ill posed problem, incorrect formulation of the problem or missing informations

• the function has to be function in two variables,
• the limits for outside integral have to be numbers,
• the limits for the inside integral numbers or functions of variable which is used for outside integration,
• he lower limit must be smaller or equal to the upper limit for integration for both integrals.
One of these conditions has been violated or Maxima failed to verify these conditions (in most cases due to a typing error or bad mathematical formula on input).

#### Variable for inside integration and limits for this variable:

Invalid limits for integration. Limits for the inside integral cannot contain the variable y, which is used for inside integration.

Maxima 5.27.0 http://maxima.sourceforge.net
using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (a.k.a. GCL)
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1)                          display2d : false
(%i2) checkon:1
(%i3) f:(x+y)^2
(%i4) opttrigsimp(f):=f
(%i5) vnejsi:x
(%i6) vnitrni:y
(%i7) coor1(m,n):=n
(%i8) coor2(m,n):=m
(%i9) a:-1
(%i10) b:1
(%i11) c:0
(%i12) d:y
(%i13) coord1min:-0.5
(%i14) coord1max:1.5
(%i15) coord2min:-0.5
(%i16) coord2max:1.5