Here, applying the Scale-Symmetric Theory (SST), we show that the GASER (Gamma Amplifier by Stimulated Emission of Radiation) is characteristic for stars with a mass close to one solar mass. SST shows that in reality the observed neutrino “oscillations” follow from the exchanges of the free neutrinos (they interact gravitationally only) for the neutrinos in the neutrino-antineutrino pairs the Einstein spacetime consists of, and follow from the decays of the unstable tau-neutrinos. Just due to the irreversible processes during the inflation, the neutrino-antineutrino pairs cannot annihilate and neutrinos cannot change their species. Notice as well that there is no reliable experimental data showing that at such a short distance as between the Sun and Earth, two-thirds of electron-neutrinos could change their species. SST shows that there are the exchanges and decays of the neutrinos but their abundance should be much lower than it is assumed in the mainstream cosmology. We must find a different mechanism explaining why we see only about one-third of the electron-neutrinos. Here we show that the solar neutrino problem can be solved via the stellar GASER which is characteristic for stars with a mass close to one solar mass. GASER causes that we observe only about 35.7% electron-neutrinos in comparison with abundance calculated within the Big Bang Nucleosynthesis. The GASER solves as well the lithium problem. The lithium problem should be characteristic for old stars with mass below 0.94 solar mass. The various nuclear transformations in such stars cause that the production of lighter nuclei is not such effective as it is assumed in the Big Bang Nucleosynthesis.