Dear Experts, I am using xtreg fe and xtreg re on my panel dataset of 2921 firms. have declared the data to be panel by xtset ID YEAR. The problem i face is all independent variables are omitted in case of xtreg fe and insufficient observations is the response i get when i try xtreg re. However xtreg mle gives the output. I have checked the data for missing values with "mdesc" command. There are no missing values in my data Please help me solve this issue. Below i am pasting the model code wth STATA's response:

. xtreg logTLR Size AGR Assets_Turnover SGR ICR RONW logprofitability logtax_burden logliquidity, re
insufficient observations
r(2001);

. xtreg logTLR Size AGR Assets_Turnover SGR ICR RONW logprofitability logtax_burden logliquidity, fe
note: Size omitted because of collinearity
note: AGR omitted because of collinearity
note: Assets_Turnover omitted because of collinearity
note: SGR omitted because of collinearity
note: ICR omitted because of collinearity
note: RONW omitted because of collinearity
note: logprofitability omitted because of collinearity
note: logtax_burden omitted because of collinearity
note: logliquidity omitted because of collinearity

Fixed-effects (within) regression Number of obs = 49,657
Group variable: ID Number of groups = 49,657

R-sq: Obs per group:
within = . min = 1
between = . avg = 1.0
overall = . max = 1

F(0,0) = 0.00
corr(u_i, Xb) = . Prob > F = .

----------------------------------------------------------------------------------
logTLR | Coef. Std. Err. t P>|t| [95% Conf. Interval]
----------------- -------- +----------------------------------------------------------------
Size | 0 (omitted)
AGR | 0 (omitted)
Assets_Turnover | 0 (omitted)
SGR | 0 (omitted)
ICR | 0 (omitted)
RONW | 0 (omitted)
logprofitability | 0 (omitted)
logtax_burden | 0 (omitted)
logliquidity | 0 (omitted)
_cons | .8852116 . . . . .
-----------------+----------------------------------------------------------------
sigma_u | 1.3029188
sigma_e | .
rho | . (fraction of variance due to u_i)
----------------------------------------------------------------------------------
F test that all u_i=0: F(49656, 0) = . Prob > F = .