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

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).

Integral:

\int_{ -1 }^{ 1 }\left[\;\int_{ 0 }^{ y }\left( \left(y+x\right)^2 \right)\,dy \;\right]\;dx

Variable for outside integration and limits for this variable:

 -1 \leq x \leq  1

Variable for inside integration and limits for this variable:

 0 \leq y \leq  y
Invalid limits for integration. Limits for the inside integral cannot contain the variable y, which is used for inside integration.
Bad limits or bad order of variables for integration.

Maxima 5.27.0 http://maxima.sourceforge.net
using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (a.k.a. GCL)
Distributed under the GNU Public License. See the file COPYING.
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
(%i17) load("/var/www/maw/integral/simpinvtrigh.mac")
(%i18) load("/var/www/maw/integral2/integral2.mac")
### funkce \left(y+x\right)^2
 ### 
### vnejsimezea -1
 ### 
### vnejsimezeb 1
 ### 
### vnitrnimezec 0
 ### 
### vnitrnimezed y
 ### 
invalid inside limits - bad variable