hello great master
I have a question
My stata version is 14
when I perform the instruction, it always displays the error message
what can I do?

////stata instruction///
xtset state year
replace age15to24 = 100*age15to24
synth cigsale cigsale(1988) cigsale(1980) cigsale(1975) lnincome retprice ///
age15to24 beer(1984(1)1988), trunit(3) trperiod(1989)

file synthopt.plugin not found <-------error message
(error occurred while loading synth.ado)


/////data////
clear
input long state float(year cigsale lnincome beer age15to24 retprice cigsale_cal cigsale_rest)
1 1970 89.8 . . 1788.618 39.6 . 120.08421
1 1971 95.4 . . 1799.2784 42.7 . 123.86316
1 1972 101.1 9.498476 . 1809.939 42.3 . 129.17896
1 1973 102.9 9.550107 . 1820.5994 42.1 . 131.53947
1 1974 108.2 9.537163 . 1831.26 43.1 . 134.66843
1 1975 111.7 9.540031 . 1841.9207 46.6 . 136.93158
1 1976 116.2 9.591908 . 1852.581 50.4 . 141.26053
1 1977 117.1 9.617496 . 1863.242 50.1 . 141.08948
1 1978 123 9.654072 . 1873.9023 55.1 . 140.47368
1 1979 121.4 9.64918 . 1884.563 56.8 . 138.08684
1 1980 123.2 9.612194 . 1895.2234 60.6 . 138.08948
1 1981 119.6 9.609594 . 1858.4222 68.8 . 137.98685
1 1982 119.1 9.59758 . 1821.621 73.1 . 136.29474
1 1983 116.3 9.626769 . 1784.8202 84.4 . 131.25
1 1984 113 9.671621 18 1748.019 90.8 . 124.90263
1 1985 114.5 9.703193 18.7 1711.218 99 . 123.1158
1 1986 116.3 9.74595 19.3 1674.4167 103 . 120.59473
1 1987 114 9.762092 19.4 1637.6157 110 . 117.58685
1 1988 112.1 9.78177 19.4 1600.8146 114.4 . 113.82368
1 1989 105.6 9.802527 19.4 1564.0134 122.3 . 109.66315
1 1990 108.6 9.81429 20.1 1527.2124 139.1 . 105.66579
1 1991 107.9 9.81926 20.1 . 144.4 . 104.3421
1 1992 109.1 9.845286 20.4 . 172.2 . 103.39474
1 1993 108.5 9.85216 20.3 . 176.2 . 102.69473
1 1994 107.1 9.879334 21 . 154.6 . 102.11842
1 1995 102.6 9.924404 20.6 . 155.1 . 103.1579
1 1996 101.4 9.940027 21 . 158.3 . 101.18421
1 1997 104.9 9.93727 20.8 . 167.4 . 101.78947
1 1998 106.2 . . . 180.5 . 100.9579
1 1999 100.7 . . . 195.6 . 97.59473
1 2000 96.2 . . . 270.7 . 92.13421
2 1970 100.3 . . 1690.0676 36.7 . 120.08421
2 1971 104.1 . . 1699.5386 38.8 . 123.86316
2 1972 103.9 9.464514 . 1709.0095 44.1 . 129.17896
2 1973 108 9.55683 . 1718.4805 45.1 . 131.53947
2 1974 109.7 9.542286 . 1727.9513 45.5 . 134.66843
2 1975 114.8 9.514094 . 1737.4224 48.6 . 136.93158
2 1976 119.1 9.558153 . 1746.8933 50.9 . 141.26053
2 1977 122.6 9.590923 . 1756.364 52.6 . 141.08948
2 1978 127.3 9.657238 . 1765.835 56.5 . 140.47368
2 1979 126.5 9.633533 . 1775.306 58.4 . 138.08684
2 1980 131.8 9.573803 . 1784.777 61.5 . 138.08948
2 1981 128.7 9.593041 . 1750.1112 64.7 . 137.98685
2 1982 127.4 9.5737 . 1715.4453 72.1 . 136.29474
2 1983 128 9.593053 . 1680.7794 82 . 131.25
2 1984 123.1 9.65044 17.9 1646.1138 93.6 . 124.90263
2 1985 125.8 9.675527 18.1 1611.448 98.5 . 123.1158
2 1986 126 9.705939 18.7 1576.782 103.6 . 120.59473
2 1987 122.3 9.705574 19 1542.1163 113 . 117.58685
2 1988 121.5 9.721532 18.9 1507.4504 119.9 . 113.82368
2 1989 118.3 9.73737 19 1472.7847 127.7 . 109.66315
2 1990 113.1 9.736311 19.9 1438.119 141.2 . 105.66579
2 1991 116.8 9.743068 19.9 . 146.5 . 104.3421
2 1992 126 9.788629 20 . 177.3 . 103.39474
2 1993 113.8 9.785142 19.7 . 179.9 . 102.69473
2 1994 108.8 9.813631 19.7 . 168.1 . 102.11842
2 1995 113 9.86446 19.5 . 167.3 . 103.1579
2 1996 110.7 9.885234 20.1 . 167.1 . 101.18421
2 1997 108.7 9.883107 19.8 . 181.3 . 101.78947
2 1998 109.5 . . . 187.3 . 100.9579
2 1999 104.8 . . . 206.9 . 97.59473
2 2000 99.4 . . . 279.3 . 92.13421
3 1970 123 . . 1781.5833 38.8 123 .
3 1971 121 . . 1792.9636 39.7 121 .
3 1972 123.5 9.930814 . 1804.344 39.9 123.5 .
3 1973 124.4 9.955092 . 1815.724 39.9 124.4 .
3 1974 126.7 9.947999 . 1827.1044 41.9 126.7 .
3 1975 127.1 9.937167 . 1838.4847 45 127.1 .
3 1976 128 9.976858 . 1849.865 48.3 128 .
3 1977 126.4 10.0027 . 1861.2454 49 126.4 .
3 1978 126.1 10.045565 . 1872.6255 58.7 126.1 .
3 1979 121.9 10.054688 . 1884.0057 60.1 121.9 .
3 1980 120.2 10.03784 . 1895.386 62.1 120.2 .
3 1981 118.6 10.028626 . 1855.3705 66.4 118.6 .
3 1982 115.4 10.01253 . 1815.355 72.8 115.4 .
3 1983 110.8 10.031737 . 1775.3394 84.9 110.8 .
3 1984 104.8 10.07536 25 1735.324 94.9 104.8 .
3 1985 102.8 10.099703 24 1695.3083 98 102.8 .
3 1986 99.7 10.127267 24.7 1655.2927 104.4 99.7 .
3 1987 97.5 10.1343 24.1 1615.277 103.9 97.5 .
3 1988 90.1 10.141663 23.6 1575.2615 117.4 90.1 .
3 1989 82.4 10.142313 23.7 1535.246 126.4 82.4 .
3 1990 77.8 10.141623 23.8 1495.2303 163.8 77.8 .
3 1991 68.7 10.110714 22.3 . 186.8 68.7 .
3 1992 67.5 10.11494 21.3 . 201.9 67.5 .
3 1993 63.4 10.098497 20.8 . 205.1 63.4 .
3 1994 58.6 10.099508 20.1 . 190.3 58.6 .
3 1995 56.4 10.155916 19.7 . 195.1 56.4 .
3 1996 54.5 10.178637 19.1 . 197.9 54.5 .
3 1997 53.8 10.17519 19.5 . 200.3 53.8 .
3 1998 52.3 . . . 207.8 52.3 .
3 1999 47.2 . . . 224.9 47.2 .
3 2000 41.6 . . . 351.2 41.6 .
4 1970 124.8 . . 1909.5022 29.4 . 120.08421
4 1971 125.5 . . 1916.476 31.1 . 123.86316
4 1972 134.3 9.805548 . 1923.4497 31.2 . 129.17896
4 1973 137.9 9.848413 . 1930.4232 32.7 . 131.53947
4 1974 132.8 9.840451 . 1937.397 38.1 . 134.66843
4 1975 131 9.828461 . 1944.3706 41.7 . 136.93158
4 1976 134.2 9.858913 . 1951.344 44.8 . 141.26053
end