VHDL Loop error: Process Statement must contain only one Wait Statement

Error (10398): VHDL Process Statement error at count31.vhd(27): Process Statement must contain only one Wait Statement

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library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.STD_LOGIC_ARITH.all;
use IEEE.STD_LOGIC_UNSIGNED.all;

entity COUNT31 is

port ( CLK: in std_logic;

COUNT: out integer);

end COUNT31;

architecture behav_COUNT of COUNT31 is

begin

P_COUNT: process

variable intern_value: integer;

begin

intern_value:=0;
while (intern_value<31) loop

wait until CLK='1';
intern_value:=intern_value + 1;
COUNT <= intern_value;

end loop;

end process P_COUNT;

end behav_COUNT;

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Error (10519): VHDL Type or Variable Declaration error at camera.vhd(44): bounds of type or variable range must have same type

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Error (10515): VHDL type mismatch error at camera.vhd(44): integer type does not match string literal

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LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

ENTITY camera IS

PORT
(
start : IN STD_LOGIC;
pixel : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
clk : IN STD_LOGIC;
vsync : IN STD_LOGIC;
href : IN STD_LOGIC;
pclk : IN STD_LOGIC;

pixel_out : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
reference : OUT STD_LOGIC
);

END camera;

ARCHITECTURE behave OF camera IS

SIGNAL frame_count : STD_LOGIC_VECTOR(6 DOWNTO 0);
SIGNAL line_count : STD_LOGIC_VECTOR(6 DOWNTO 0);
SIGNAL pixel_count : STD_LOGIC_VECTOR(6 DOWNTO 0);

BEGIN



PROCESS (vsync, href, pclk)
BEGIN

IF start='1' THEN--------------------------------------------STARTS THE CAPTURING SEQUENCE

frame_count <= (OTHERS => '0');
line_count <= (OTHERS => '0');
pixel_count <= (OTHERS => '0');

IF(vsync'EVENT AND vsync = '1' ) THEN
FOR frame_count IN "0000000" TO "111100" LOOP
frame_count <= frame_count + "0000001"; -------------COUNTS FRAME UNTIL 60

IF(href'EVENT AND href = '1' ) THEN
FOR line_count IN "0000000" TO "110010" LOOP
line_count <= line_count + "0000001";---------COUNTS LINE UNTIL 50

IF(pclk'EVENT AND pclk = '1' ) THEN
FOR pixel_count IN "0000000" TO "110010" LOOP
pixel_count <= pixel_count + "0000001"; --COUNTS PIXEL UNTIL 50

pixel_out<=pixel;-----------------------------OUTPUTS THE PIXEL DATA
reference<='1';------------------------------FOR SAVING THE DATA INTO RAM PURPOSES
END LOOP;

END IF;
END LOOP;
END IF;
END LOOP;
END IF;
ELSE

null;
END IF;


END PROCESS;

END behave;

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